A series of regioisomers of 4,5-dihydroisoxazolecarboxylates have been synt
hesized in the 1,3-dipolar intermolecular cycloaddition and subjected to en
zymatic hydrolysis by alpha-chymotrypsin from bovine pancreas (type IT) and
to microbial hydrolysis by an Aspergillus niger fungus. For some compounds
this hydrolysis time led to the obtaining of a racemic mixture, and for ot
hers the reaction was enantioselective.