The present disclosure provides methods for enantioselective synthesis of acyclic -quaternary carboxylic acid derivatives via iridium-catalyzed allylic alkylation.

The present invention is directed to methods for the preparation of eremophila-1(10)-11(13)-dien-12,8?-olide (EPD) and analogues thereof.

The present invention is directed to methods for the preparation of eremophila-1(10)-11(13)-dien-12,8?-olide (EPD) and analogues thereof.

Disclosed in the present invention is a preparation method for a tetra-substituted allenoic acid compound based on a palladium catalytic system, that is, a highly optically active allenoic acid compound having axial chirality is directly constructed in one step by reacting tertiary propargyl alcohol, carbon monoxide and water in an organic solvent under the action of a palladium catalyst, a chiral bisphosphine ligand, an organophosphoric acid, and an organic additive, and the theoretical yield can reach 100%. The method of the present invention is simple to operate, the raw materials and reagents are readily available, the reaction conditions are mild, the substrate universality is wide, the functional group compatibility is good, the reaction has high enantioselectivity (77%?96% ee), and the reaction is well compatible with complex natural products or substrates of a drug molecular skeleton. The highly optically active allenoic acid compound obtained by the present invention can be used as an important intermediate for constructing a ?-butyrolactone compound containing a tetra-substituted chiral quaternary carbon center, tetra-substituted allenol, tetra-substituted allenal, tetra-substituted allenyl ketone, tetra-substituted allenami de and other compounds.

The present invention provides modified cycloalkyne compounds; and method of use of such compounds in modifying biomolecules. The present invention features a cycloaddition reaction that can be carried out under physiological conditions. In general, the invention involves reacting a modified cycloalkyne with an azide moiety on a target biomolecule, generating a covalently modified biomolecule. The selectivity of the reaction and its compatibility with aqueous environments provide for its application in vivo (e.g., on the cell surface or intracellularly) and in vitro (e.g., synthesis of peptides and other polymers, production of modified (e.g., labeled) amino acids).

The present invention provides modified cycloalkyne compounds; and method of use of such compounds in modifying biomolecules. The present invention features a cycloaddition reaction that can be carried out under physiological conditions. In general, the invention involves reacting a modified cycloalkyne with an azide moiety on a target biomolecule, generating a covalently modified biomolecule. The selectivity of the reaction and its compatibility with aqueous environments provide for its application in vivo (e.g., on the cell surface or intracellularly) and in vitro (e.g., synthesis of peptides and other polymers, production of modified (e.g., labeled) amino acids).

The present invention relates to a class of fatty acid compounds, a preparation method thereof and use thereof. The fatty acid compounds have the structure of the formula I, which has the ability to activate APMK and inhibit the glucose output in mouse primary hepatocytes. The fatty acid compounds can be used in preparing a medicament for the treatment of obesity or diabetes.

##STR00001##

The present invention relates to a class of fatty acid compounds, a preparation method thereof and use thereof. The fatty acid compounds have the structure of the formula I, which has the ability to activate APMK and inhibit the glucose output in mouse primary hepatocytes. The fatty acid compounds can be used in preparing a medicament for the treatment of obesity or diabetes.

##STR00001##

The present disclosure provides methods for enantioselective synthesis of acyclic -quaternary carboxylic acid derivatives via iridium-catalyzed allylic alkylation.

The present disclosure provides methods for enantioselective synthesis of acyclic -quaternary carboxylic acid derivatives via iridium-catalyzed allylic alkylation.