The present invention involves preparing compounds represented by the following formula:

##STR00001##

from a compound of the following formula:

##STR00002##

In these formulae: R.sup.1 represents a Br group, an iodine group, a Cl group, an NO.sub.2 group, or an NH.sub.2 group; R.sup.2 represents a halogen group, an NO.sub.2 group, an NH.sub.2 group, Sn(R.sup.6).sub.3, N═N—NR.sup.7R.sup.8, OSO.sub.2R.sup.9, N R.sup.10R.sup.11, phenyliodonium, a heterocyclic group iodine, boric acid, or a borate ester; R.sup.30 represents a protective group PG.sup.1; R.sup.40 or R.sup.50 represent hydrogen, a protective group PG.sup.2, or C.sub.6H.sub.5(C.sub.6H.sub.5)C═N, in which NR.sup.40R.sup.50 are together.

The present invention involves preparing compounds represented by the following formula:

##STR00001##

from a compound of the following formula:

##STR00002##

In these formulae: R.sup.1 represents a Br group, an iodine group, a Cl group, an NO.sub.2 group, or an NH.sub.2 group; R.sup.2 represents a halogen group, an NO.sub.2 group, an NH.sub.2 group, Sn(R.sup.6).sub.3, N═N—NR.sup.7R.sup.8, OSO.sub.2R.sup.9, N R.sup.10R.sup.11, phenyliodonium, a heterocyclic group iodine, boric acid, or a borate ester; R.sup.30 represents a protective group PG.sup.1; R.sup.40 or R.sup.50 represent hydrogen, a protective group PG.sup.2, or C.sub.6H.sub.5(C.sub.6H.sub.5)C═N, in which NR.sup.40R.sup.50 are together.

A method for producing an optically active α-trifluoromethyl-β-amino acid derivative, the method including: allowing a compound represented by the following General Formula (1) and a compound represented by the following General Formula (2) to react in the presence of a copper-optically active phosphine complex obtained from a copper compound and an optically active phosphine compound, to thereby obtain an optically active α-trifluoromethyl-β-amino acid derivative represented by the following General Formula (3):

##STR00001##

Provided is a catalyst for transesterification reactions, which contains an iron salen complex. Also provided is a method for producing an ester compound, which is characterized by carrying out a transesterification reaction between a starting material ester and a starting material alcohol with use of the catalyst.

Provided is a catalyst for transesterification reactions, which contains an iron salen complex. Also provided is a method for producing an ester compound, which is characterized by carrying out a transesterification reaction between a starting material ester and a starting material alcohol with use of the catalyst.

The invention relates to an overall enantio-specific synthesis of 4-chlorokynurenine compounds, in particular L-4-chlorokynurenine, with improved yields. Large-scale syntheses are disclosed. The invention also relates to novel intermediates in the synthesis of L-4-chlorokynurenine.

The invention relates to an overall enantio-specific synthesis of 4-chlorokynurenine compounds, in particular L-4-chlorokynurenine, with improved yields. Large-scale syntheses are disclosed. The invention also relates to novel intermediates in the synthesis of L-4-chlorokynurenine.

The invention relates to an overall enantio-specific synthesis of 4-chlorokynurenine compounds, in particular L-4-chlorokynurenine, with improved yields. Large-scale syntheses are disclosed. The invention also relates to novel intermediates in the synthesis of L-4-chlorokynurenine.

An objective of the present invention is to provide novel cyclic depsipeptide derivatives and harmful organism control agents including the same as each other. Specifically, the present invention provides compounds represented by formula (1) or stereoisomers thereof, harmful organism control agents containing them, and a process for producing them.

##STR00001##

An objective of the present invention is to provide novel cyclic depsipeptide derivatives and harmful organism control agents including the same as each other. Specifically, the present invention provides compounds represented by formula (1) or stereoisomers thereof, harmful organism control agents containing them, and a process for producing them.

##STR00001##