Method for preparing high-purity sulfonamide compound, and intermediate of sulfonamide compound

Abstract

The present invention discloses a method for preparing a high-purity sulfonamide compound and an intermediate of the sulfonamide compound. The method comprises the following steps: a, taking a crude product of a sulfonamide compound (I) as an initial raw material, and enabling the raw material to react with a compound of a formula (II) in presence of alkali and a catalyst so as to synthesize an intermediate of a formula (III); and b, enabling the compound represented by the formula (III) to react with alkali or acid, thereby obtaining the high-purity sulfonamide compound (I).

Claims

1. A method for preparing a high-purity sulfonamide compound, comprising: a, reacting with a compound of a formula (II) under the action of a solvent, a base and a catalyst by taking a crude sulfonamide compound (I) as an initial raw material, so as to synthesize a compound of a formula (III); and b, enabling the compound represented by the formula (III) to react with a base or an acid in a solvent and obtaining the sulfonamide compound (I) having a purity of 99% or higher; a general formula of the reactions is as follows: ##STR00007## wherein R is methyl, or aryl or heteroaryl shown as follows: ##STR00008## Ar is aryl or heteroaryl shown as follows: ##STR00009## X is halogen or test-butoxy carbonyloxy; and Y is C1-C6 alkyl, C6-C12 aryl or tert-butoxy.

2. The method according to claim 1, wherein X is Cl or tert-butoxy carbonyloxy, and C1-C6 alkyl or tert-butoxy.

3. The method according to claim 1, wherein a molar ratio of the compound (II) to the crude product of the sulfonamide compound (I) is (0.8-2):1.

4. The method according to claim 1, wherein the base in the step a is an organic base; a molar ratio of the organic base to the crude sulfonamide compound (I) is (1-2):1; the catalyst is 4-dimethylaminopyridine; a weight percentage of the catalyst to the crude sulfonamide compound (I) is 0.05-10%; the solvent is selected from the group consisting of halohydrocarbons, ether, and nitriles; and a reaction temperature is 10 C.-80 C.

5. The method according to claim 4, wherein the organic base in the step a is triethylamine, DBU or pyridine; the is solar ratio of the organic base to the crude product of the sulfonamide compound (I) is (1-1.3):1; the weight percentage of the catalyst to the crude product of the sulfonamide compound (I) is 0.1-5%; the solvent is dichloromethane, tetrahydrofuran, or acetonitrile; and the reaction temperature is 0 C.-40 C.

6. The method according to claim 1, wherein the base in the step b is a hydroxide, carbonate or hydrocarbonate of alkali metals and alkaline-earth metals, a molar ratio of the base to the compound (III) is (0.5-1.5):1, the solvent is methanol, ethanol, isopropanol, acetonitrile, acetone, DMF or DMSO, and a reaction temperature is 0 C.-80 C.; or the acid in the step b refers to an inorganic acid or an organic acid, a molar ratio of the acid to the compound (III) is (0.5-1.5):1, the solvent refers to methanol, ethanol, isopropanol, acetonitrile, acetone, DMF or DMSO, and a reaction temperature is 0 C.-80 C.

7. The method according to claim 6, wherein the base in the step b is sodium carbonate, potassium carbonate, sodium bicarbonate or potassium bicarbonate, the molar ratio of the base to the compound (III) is (0.75-1.25):1, the solvent is ethanol, and the reaction temperature is 10 C.-60 C.; or the acid in the step b is hydrochloric acid, sulfuric acid or trifluoroacetic acid, the molar ratio of the acid to the compound (III) is (0.75-1.25):1, the solvent is ethanol, and the reaction temperature is 10 C.-60 C.

Description

DETAILED DESCRIPTION OF THE INVENTION

(1) To understand technical contents of the present invention more clearly, the present invention is further described with reference to the following embodiments, but the present invention is not limited by the following embodiments.

Embodiment 1 Preparation of N-acetyl-N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide

(2) The preparation method comprises the following steps:

(3) sequentially adding a crude product of N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide (HPLC purity is 95.8%) (10.0 g, 1.0 eq), DMAP (0.01 g), acetonitrile (100 mL) and triethylamine (3.0 g, 1.2 eq) into a 250 mL reaction flask at room temperature, and dropwise adding acetyl chloride (2.1 g, 1.1 eq); continuously reacting for 3 h after finishing dropwise adding, stopping the reaction when the raw materials are completely reacted as determined by HPLC, distilling to remove the acetonitrile and adding water, extracting for three times with dichloromethane, merging organic phases, washing with brine and drying with anhydrous magnesium sulfate, washing the white solid obtained by filtering and concentrating with ethanol, and drying to obtain 10.3 g of the white solid, the HPLC purity is 99.1%. .sup.1H NMR (400 MHz, D6-DMSO) : 7.72 (m, 2H), 7.62 (m, 1H), 7.50 (s, 1H), 4.73 (m, 2H), 2.12(s, 3H), 1.48 (m, 3H).

Embodiment 2 Preparation of N-(2-bromoacetyl)-N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide

(4) The preparation method comprises the following steps:

(5) sequentially adding a crude product of N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide (HPLC purity of 95.8%) (10.0 g, 1.0 eq), DMAP (0.01 g), THF (100 mL) and triethylamine (3.0 g, 1.2 eq) into a 250 mL reaction flask at room temperature, and dropwise adding bromoacetyl bromide (5.5 g, 1.1 eq); continuously reacting for 2 h after finishing dropwise adding, stopping the reaction when the raw materials are completely reacted as determined by HPLC, distilling to remove the THF and adding water, extracting for three times with dichloromethane, merging organic phases, washing with brine and then drying with anhydrous magnesium sulfate, washing the white solid obtained by filtering and concentrating with ethanol, and drying to obtain 12.3 g of the white solid, wherein the HPLC purity is 99.5%. .sup.1H NMR (400 MHz, D6-DMSO) : 7.76 (m, 2H), 7.68 (m, 1H), 7.57 (s, 1H), 4.87 (s, 2H), 4.76 (m, 2H), 1.50 (m, 3H).

Embodiment 3 Preparation of N-(2-chloracetyl)-N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide

(6) The preparation method comprises the following steps:

(7) sequentially adding a crude product of N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide (HPLC purity of 95.8%) (10.0 g, 1.0 eq), DMAP (0.01 g), THF (100 mL) and triethylamine (3.0 g, 1.2 eq) into a 250 mL reaction flask at room temperature, and dropwise adding chloroacetyl chloride (3.1 g, 1.1 eq); continuously reacting for 2 h after finishing dropwise adding, stopping the reaction when the raw materials are completely reacted as determined by HPLC, distilling to remove the THF and adding water, extracting for three times with dichloromethane, merging organic phases, washing with brine and then drying with anhydrous magnesium sulfate, washing the white solid obtained by filtering and concentrating with ethanol, and drying to obtain 11.4 g white solid, wherein the HPLC purity is 99.3%. .sup.1H NMR (400 MHz, D6-DMSO) : 7.72 (m, 2H), 7.62 (m, 1H), 7.50 (s, 1H), 4.97 (s, 2H), 4.73 (m, 2H), 1.48 (m, 3H).

Embodiment 4 Preparation of N-(2,2-dichloroacetyl)-N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide

(8) The preparation method comprises the following steps:

(9) sequentially adding a crude product of N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide (HPLC purity is 95.8%) (10.0 g, 1.0 eq), DMAP (0.01 g), THF (100 mL) and triethylamine (3.0 g, 1.2 eq) into a 250 mL reaction flask at room temperature, and dropwise adding dichloracetyl chloride (4.0 g, 1.1 eq); continuously reacting for 1 h after finishing dropwise adding, stopping the reaction when the raw materials are completely reacted as determined by HPLC, distilling to remove the THF and adding water, extracting for three times with dichloromethane, merging organic phases, washing with brine and then drying with anhydrous magnesium sulfate, washing the white solid obtained by filtering and concentrating with ethanol, and drying to obtain 11.6 g white solid, and the HPLC purity is 99.0%. .sup.1H NMR (400 MHz, D6-DMSO) : 7.75 (m, 2H), 7.63 (m, 1H), 7.54 (s, 1H), 6.80 (s, 1H), 4.78 (m, 2H), 1.46 (m, 3H).

Embodiment 5 Preparation of N-benzoyl-N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide

(10) N-benzoyl-N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide is prepared by a method similar to that in embodiment 1, it is a white solid and the HPLC purity is 98.7%. .sup.1H NMR (400 MHz, D6-DMSO) : 7.95-6.86 (m, 9H), 3.98 (m, 2H), 1.33 (m, 3H).

Embodiment 6 Preparation of N-(2-methoxyacetyl)-N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide

(11) N-(2-methoxyacetyl)-N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide is prepared by a method similar to that in embodiment 1, it is a white solid and the HPLC purity is 98.8%. .sup.1H NMR (400 MHz, D6-DMSO) : 7.70-7.71 (m, 2H), 7.60-7.61 (m, H), 7.49 (s, H), 4.74 (q, 2H), 4.57 (s, 3H), 1.47 (t, 3H).

Embodiment 7 Preparation of 2-(2,2-difluoroethoxyl)-N-(2-chloracetyl)-N-(5,8-dimethoxy-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)-6-trifluoromethyl benzenesulfonamide

(12) 2-(2,2-difluoroethoxyl)-N-(2-chloracetyl)-N-(5,8-dimethoxy-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)-6-trifluoromethyl benzenesulfonamide is prepared by a method similar to that in embodiment 1, it is a white solid and the HPLC purity is 98.9%. NMR (400 MHz, D6-DMSO) : 7.72-7.96 (m, 4H), 6.75 (t, 1H), 4.77 (m, 2H), 4.35 (s, 2H), 4.20 (s, 3H), 4.04 (s, 3H).

Embodiment 8 Preparation of 2-(2,2-difluoroethoxyl)-N-acetyl-N-(5,8-dimethoxy-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)-6-trifluoromethyl benzenesulfonamide

(13) 2-(2,2-difluoroethoxyl)-N-acetyl-N-(5,8-dimethoxy-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)-6-trifluoromethyl benzenesulfonamide is prepared by a method similar to that in embodiment 1, it is a white solid, and the HPLC purity is 98.7%. .sup.1H NMR (400 MHz, D6-DMSO) : 7.70-7.92 (m, 4H), 6.76 (t, 1H), 4.78 (m, 2H), 4.20 (s, 3H), 4.02 (s, 3H), 1.95 (s, 3H).

Embodiment 9 Preparation of 2-(2,2-difluoroethoxyl)-N-benzoyl-N-(5,8-dimethoxy-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)-6-trifluoromethyl benzenesulfonamide

(14) 2-(2,2-difluoroethoxyl)-N-benzoyl-N-(5,8-dimethoxy-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)-6-trifluoromethyl benzenesulfonamide is prepared by a method similar to that in embodiment 1, it is a white solid, and the HPLC purity is 99.0%. NMR (400 MHz, D6-DMSO) : 7.31-7.96 (m, 9H), 6.35 (t, 1H), 4.64 (m, 2H), 4.13 (s, 3H), 3.94 (s, 3H).

Embodiment 10 Preparation of 2-(2,2-difluoroethoxyl)-N-(2-methoxyacetyl)-N-(5,8-dimethoxy-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)-6-trifluoromethyl benzenesulfonamide

(15) 2-(2,2-difluoroethoxyl)-N-(2-methoxyacetyl)-N-(5,8-dimethoxy-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)-6-trifluoromethyl benzenesulfonamide is prepared by a method similar to that in embodiment 1, it is a white solid, and the HPLC purity is 98.8%. NMR (400 MHz, D6-DMSO) : 7.70-7.92 (m, 4H), 6.70 (t, 1H), 4.74 (m, 2H), 4.17 (s, 3H), 3.99 (s, 3H), 3.82 (s, 2H), 3.13 (s, 3H).

Embodiment 11 Preparation of N-(2-methoxyacetyl)-3-chloro-2-[(5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)sulfonamide]methyl benzoate

(16) N-(2-methoxyacetyl)-3-chloro-2-[(5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)sulfonamide]methyl benzoate is prepared by a method similar to that in embodiment 1, and the HPLC purity is 95.9%. .sup.1H NMR (400 MHz, D6-DMSO) : 7.99 (t, 2H), 7.73 (t, 1H), 7.46 (s, 1H), 4.74 (q, 2H), 3.69 (s, 1H), 3.67 (s, 3H), 3.28 (s, 3H), 1.98 (s, 1H), 1.50 (t, 3H).

Embodiment 12 Preparation of N-benzoyl-3-chloro-2-[(5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)sulfonamide]methyl benzoate

(17) N-benzoyl-3-chloro-2-[(5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)sulfonamide]methyl benzoate is prepared by a method similar to that in embodiment 1, and the HPLC purity is 99.1%. .sup.1H NMR (400 MHz, D6-DMSO) : 7.87-7.89 (m, 2H), 7.60-7.62 (m, 1H), 7.52-7.53 (m, 2H), 7.40-7.43 (m, 2H), 7.28-7.31 (m, 2H), 4.74 (q, 2H), 3.78 (s, 3H), 1.51 (t, 3H).

Embodiment 13 Preparation of N-acetyl-3-chloro-2-[(5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)sulfonamide]methyl benzoate

(18) N-acetyl-3-chloro-2-[(5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)sulfonamide]methyl benzoate is prepared by a method similar to that in embodiment 1, and the HPLC purity is 99.2%. .sup.1H NMR (400 MHz, D6-DMSO) : 7.94-7.98 (m, 2H), 7.71 (t, 1H), 7.45 (s, 1H), 4.73 (t, 2H), 3.66 (s, 3H), 1.49 (t, 3H).

Embodiment 14 Preparation of N-(2-chloracetyl)-3-chloro-2-[(5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)sulfonamide]methyl benzoate

(19) N-(2-chloracetyl)-3-chloro-2-[(5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)sulfonamide]methyl benzoate is prepared by a method similar to that in embodiment 1, and the HPLC purity is 98.2%. .sup.1H NMR (400 MHz, D6-DMSO) : 7.97-8.02 (m, 2H), 7.76 (t, 1H), 7.46 (s, 1H), 4.73 (q, 2H), 3.66 (s, 3H), 1.50 (t, 3H).

Embodiment 15 Preparation of N-(2,2-dichloroacetyl)-3-chloro-2-[(5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)sulfonamide]methyl benzoate

(20) N-(2,2-dichloroacetyl)-3-chloro-2-[(5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-yl)sulfonamide]methyl benzoate is prepared by a method similar to that in embodiment 1, and the HPLC purity is 97.1%. .sup.1H NMR (400 MHz, D6-DMSO) : 8.00-8.05 (m, 2H), 7.78 (t, 1H), 7.41 (s, 1H), 4.73 (q, 2H), 3.67 (s, 3H), 1.51 (t, 3H).

Embodiment 16 Preparation of N-(2-methoxyacetyl)-N-[2,4-dichloro-5-(4-difluromethyl-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl)phenyl]methane sulfonamide

(21) N-(2-methoxyacetyl)-N-[2,4-dichloro-5-(4-difluromethyl-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl)phenyl]methane sulfonamide is prepared by a method similar to that in embodiment 1, and the HPLC purity is 95.9%. .sup.1H NMR (400 MHz, D6-DMSO) : 8.19 (s, 1H), 8.10 (s, 1H), 7.46-7.65 (m, 1H), 3.96-3.98 (m, 1H), 3.80-3.83 (m, 1H), 3.62 (s, 3H), 3.26 (s, 3H), 2.42 (s, 3H).

Embodiment 17 Preparation of N-benzoyl-N-[2,4-dichloro-5-(4-difluromethyl-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl)phenyl]methane sulfonamide

(22) N-benzoyl-N-[2,4-dichloro-5-(4-difluromethyl-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl)phenyl]methane sulfonamide is prepared by a method similar to that in embodiment 1, and the HPLC purity is 99.8%. .sup.1H NMR (400 MHz, D6-DMSO) : 8.22 (s, 1H), 7.97 (s, 1H), 7.54 (s, 2H), 7.48 (t, 2H), 7.34 (t, 2H), 7.31 (t, 2H), 3.70 (s, 3H), 2.40 (s, 3H).

Embodiment 18 Preparation of N-acetyl-N-[2,4-dichloro-5-(4-difluromethyl-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl)phenyl]methane sulfonamide

(23) N-acetyl-N-[2,4-dichloro-5-(4-difluromethyl-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl)phenyl]methane sulfonamide is prepared by a method similar to that in embodiment 1, and the HPLC purity is 99.8%. .sup.1H NMR (400 MHz, D6-DMSO) : 8.20 (s, 1H), 8.08 (s, 1H), 7.46-7.64 (m, 1H), 3.60 (s, 3H), 2.42 (s, 3H), 2.00 (s, 3H).

Embodiment 19 Preparation of N-(2-chloracetyl)-N-[2,4-dichloro-5-(4-difluromethyl-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl)phenyl]methane sulfonamide

(24) N-(2-chloracetyl)-N-[2,4-dichloro-5-(4-difluromethyl-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl)phenyl]methane sulfonamide is prepared by a method similar to that in embodiment 1, and the HPLC purity is 95.8%. .sup.1H NMR (400 MHz, D6-DMSO) : 8.19 (s, 1H), 8.10 (s, 1H), 7.48-7.65 (m, 1H), 4.27 (s, 2H), 3.64 (s, 3H), 2.42 (s, 3H).

Embodiment 20 Preparation of N-(2,2-dichloroacetyl)-N-[2,4-dichloro-5-(4-difluromethyl-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl)phenyl]methane sulfonamide

(25) N-(2,2-dichloroacetyl)-N-[2,4-dichloro-5-(4-difluromethyl-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl)phenyl]methane sulfonamide is prepared by a method similar to that in embodiment 1, and the HPLC purity is 95.8%. .sup.1H NMR (400 MHz, D6-DMSO) : 8.19 (s, 1H), 8.17 (s, 1H), 7.65 (s, 1H), 7.46-7.66 (m, 1H), 6.65 (s, 1H), 3.70 (s, 3H), 2.42 (s, 3H).

Embodiment 21 Preparation of N-(2-methoxyacetyl)-N-(2,6-difluorophenyl)-5-ethoxy-8-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide

(26) N-(2-methoxyacetyl)-N-(2,6-difluorophenyl)-5-ethoxy-8-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide is prepared by a method similar to that in embodiment 1, and the HPLC purity is 98.6%. .sup.1H NMR (400 MHz, D6-DMSO) : 8.41 (d, 1H), 7.71-7.74 (m, 1H), 7.41 (t, 2H), 4.35 (s, 2H), 4.26 (s, 3H), 3.25 (s, 3H).

Embodiment 22 Preparation of N-benzoyl-N-(2,6-difluorophenyl)-5-ethoxy-8-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide

(27) N-benzoyl-N-(2,6-difluorophenyl)-5-ethoxy-8-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide is prepared by a method similar to that in embodiment 1, and the HPLC purity is 98.5%. .sup.1H NMR (400 MHz, D6-DMSO) : 8.40 (d, 1H), 7.56-7.59 (m, 1H), 7.51 (t, 2H), 7.42 (d, 1H), 7.37 (t, 2H), 7.28 (t, 2H), 4.27 (s, 3H).

Embodiment 23 Preparation of N-acetyl-N-(2,6-difluorophenyl)-5-methyl-1,2,4-triazolo[1,5-a]pyrimidine-2-sulfamide

(28) The N-acetyl-N-(2,6-difluorophenyl)-5-methyl-1,2,4-triazolo[1,5-a]pyrimidine-2-sulfamide is prepared by a method similar to that in embodiment 1, and the HPLC purity is 97.9%. .sup.1H NMR (400 MHz, D6-DMSO) : 9.45 (d, 1H), 7.66 (d, 1H), 7.55 (d, 1H), 7.36 (t, 2H), 7.36 (t, 2H), 2.71 (s, 3H), 2.38 (s, 3H).

Embodiment 24 Preparation of N-(2-chloracetyl)-N-(2,6-difluorophenyl)-5-methyl-1,2,4-triazolo[1,5-a]pyrimidine-2-sulfamide

(29) N-(2-chloracetyl)-N-(2,6-difluorophenyl)-5-methyl-1,2,4-triazolo[1,5-a]pyrimidine-2-sulfamide is prepared by a method similar to that in embodiment 1, and the HPLC purity is 99.2%. .sup.1H NMR (400 MHz, D6-DMSO) : 9.46 (d, 1H), 7.70-7.73 (m, 1H), 7.57 (d, 1H), 7.38 (t, 2H), 4.27 (s, 2H), 2.69 (s, 3H).

Embodiment 25 Preparation of N-(2,2-dichloroacetyl)-N-(2,6-difluorophenyl)-5-methyl-1,2,4-triazolo[1,5-a]pyrimidine-2-sulfamide

(30) N-(2,2-dichloroacetyl)-N-(2,6-difluorophenyl)-5-methyl-1,2,4-triazolo[1,5-a]pyrimidine-2-sulfamide is prepared by a method similar to that in embodiment 1, and the HPLC purity is 97.2%. .sup.1H NMR (400 MHz, D6-DMSO) : 9.45 (d, 1H), 7.71 (d, 1H), 7.55 (d, 1H), 7.36 (t, 2H), 7.17 (s, 1H), 2.69 (s, 3H).

Embodiment 26 Preparation of N-(2-methoxyacetyl)-N-(2,6-difluorophenyl)-5-methyl-1,2,4-triazolo[1,5-a]pyrimidine-2-sulfamide

(31) N-(2-methoxyacetyl)-N-(2,6-difluorophenyl)-5-methyl-1,2,4-triazolo[1,5-a]pyrimidine-2-sulfamide is prepared by a method similar to that in embodiment 1, and the HPLC purity is 98.8%. .sup.1H NMR (400 MHz, D6-DMSO) : 9.45 (d, 1H), 7.68-7.70 (m, 1H), 7.55 (d, 1H), 7.36 (t, 2H), 4.50 (s, 2H), 3.28 (s, 3H), 2.71 (s, 3H).

Embodiment 27 Preparation of N-acetyl-N-(2,6-difluorophenyl)-5-ethoxy-8-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide

(32) N-acetyl-N-(2,6-difluorophenyl)-5-ethoxy-8-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide is prepared by a method similar to that in embodiment 1, and the HPLC purity is 99.3%. .sup.1H NMR (400 MHz, D6-DMSO) : 8.41 (d, 1H), 7.69-7.72 (m, 1H), 7.41 (t, 2H), 4.25 (s, 3H), 2.33 (s, 3H).

Embodiment 28 Preparation of N-t-butyloxycarboryl-N-(2,6-difluorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide

(33) N-t-butyloxycarboryl-N-(2,6-difluorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide is prepared by a method similar to that in embodiment 1, and the HPLC purity is 96.8%. .sup.1H NMR (400 MHz, D6-DMSO) : 1.43 (t, 3H), 1.67 (s, 9H), 4.78 (q, 2H), 6.82 (s, 1H), 7.22 (t, 1H), 7.35 (d, 2H).

Embodiment 29 Preparation of N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide

(34) The preparation method comprises the following steps:

(35) adding the N-t-butyloxycarboryl-N-(2,6-difluorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide (5.06 g, 1.0 eq) prepared in embodiment 28, 1 mL of concentrated hydrochloric acid and ethanol (50 mL) into a 250 mL reaction flask equipped with a mechanical stirrer, raising the temperature to 60 C. and continuously stirring and reacting for about 2 h, cooling the reaction solution to room temperature when the raw materials are completely reacted as determined by HPLC, filtering, washing a filter cake with little ethanol, and drying to a constant weight to obtain 3.97 g white solid with HPLC purity of 99.9%. .sup.1H NMR (400 MHz, D6-DMSO) : 11.05 (s, 1H), 7.51 (m, 2H), 7.37 (m, 2H), 4.65 (m, 2H), 1.47 (m, 3H).

Embodiment 30 Preparation of N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide

(36) The preparation method comprises the following steps:

(37) adding the N-acetyl-N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide (10.3 g, 1.0 eq) prepared in embodiment 1, anhydrous sodium carbonate (2.4 g, 1.0 eq) and absolute methanol (100 mL) into a 250 mL reaction flask equipped with a mechanical stirrer, raising the temperature to 55 C. and continuously stirring and reacting for about 5 h, cooling a reaction solution to room temperature when the raw materials are completely reacted as determined by HPLC, filtering, washing a filter cake with cold water, and drying to a constant weight to obtain 8.3 g white solid with HPLC purity of 99.9%. .sup.1H NMR (400 MHz, D6-DMSO) : 11.05 (s, 1H), 7.51 (m, 2H), 7.37 (m, 2H), 4.65 (m, 2H), 1.47 (m, 3H).

Embodiment 31 Preparation of N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide

(38) The preparation method comprises the following steps:

(39) adding the N-(2-bromoacetyl)-N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide (12.3 g, 1.0 eq) prepared in embodiment 2, sodium bicarbonate (2.0 g, 1.0 eq) and absolute isopropanol (100 mL) into a 250 mL reaction flask equipped with a mechanical stirrer, raising the temperature to 60 C. and continuously stirring and reacting for about 6 h, cooling a reaction solution to room temperature when the raw materials are completely reacted as determined by HPLC, filtering, washing the filter cake with cold water, filtering, and drying to a constant weight to obtain 8.0 g white solid with HPLC purity of 99.9%. .sup.1H NMR (400 MHz, D6-DMSO) : 11.05 (s, 1H), 7.51 (m, 2H), 7.37 (m, 2H), 4.65 (m, 2H), 1.47 (m, 3H).

Embodiment 32 Preparation of N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide

(40) The preparation method comprises the following steps:

(41) adding the N-(2-chloracetyl)-N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide (11.4 g, 1.0 eq) prepared in embodiment 3, potassium carbonate (3.2 g, 1.0 eq) and absolute ethyl alcohol (100 mL) into a 250 mL reaction flask equipped with a mechanical stirrer, raising the temperature to 60 C. and continuously stirring and reacting for about 6 h, cooling a reaction solution to room temperature when the raw materials are completely reacted as determined by HPLC, filtering, washing the filter cake with cold water, filtering, and drying to a constant weight to obtain 8.4 g white solid with HPLC purity of 99.9%. .sup.1H NMR (400 MHz, D6-DMSO) : 11.05 (s, 1H), 7.51 (m, 2H), 7.37 (m, 2H), 4.65 (m, 2H), 1.47 (m, 3H).

Embodiment 33 Preparation of N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide

(42) The preparation method comprises the following steps:

(43) adding the N-(2,2-dichloroacetyl)-N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro-1,2,4-triazolo[1,5-c]pyrimidine-2-sulfamide (11.6 g, 1.0 eq) prepared in embodiment 4, potassium carbonate (2.0 g, 1.0 eq) and absolute ethyl alcohol (100 mL) into a 250 mL reaction flask equipped with a mechanical stirrer, raising the temperature to 60 C. and continuously stirring and reacting for about 6 h, cooling a reaction solution to room temperature when the raw materials are completely reacted as determined by HPLC, filtering, washing the filter cake with cold water, filtering, and drying to a constant weight to obtain 7.9 g white solid with HPLC purity of 99.9%. .sup.1H NMR (400 MHz, D6-DMSO) : 11.05 (s, 1H), 7.51 (m, 2H), 7.37 (m, 2H), 4.65 (m, 2H), 1.47 (m, 3H).