Method for producing jasmonate derivatives and intermediates thereof

摘要

The present invention provides a method for efficiently producing a 2-alkyl-2-cyclopentenone as well as a method for producing a jasmonate derivative by using the same. That is, in the present invention, the compound (2) is obtained by reacting an amine and a hydrogen halide with the compound (1) at a specific ratio to carry out isomerization reaction or by reacting a catalyst comprising an amine and a hydrogen halide with the compound (3) to carry out dehydration-isomerization reaction. Further, this compound (2) is reacted with a malonic acid diester and then reacted with water to obtain a jasmonate derivative (5): <CHEM> <CHEM> <CHEM> <CHEM> wherein each of R<1> and R<2> represents H, a C1-8 alkyl group or the like, and R<3> represents a C1-3 alkyl group.