Method for preparing optically active carboxylic acid esters

Details Method for preparing optically active carboxylic acid esters Method for preparing optically active carboxylic acid esters

1981-10-20

1983-12-27

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C12175

Patent

active

044229780

ABSTRACT:
A method for preparing an optically active carboxylic acid ester of the formula (I): ##STR1## wherein X is a hydrogen atom or a fluorine atom, and * indicates an asymmetric carbon atom, which is an A.alpha.-isomer having an (S)-configuration on both the acid and alcohol moieties, or rich in said A.alpha.-isomer, which method comprises crystallizing said A.alpha.-isomer from a solution of an A-isomer of the formula (I) having an (S)-configuration on the acid moiety in the presence of a crystal that is of substantially pure A.alpha.-isomer and in the presence or absence of a basic catalyst.

REFERENCES:
patent: 4176195 (1979-11-01), Stoutamire
patent: 4238406 (1980-12-01), Suzuki et al.
patent: 4279924 (1981-07-01), Suzuki et al.
patent: 4293504 (1981-10-01), Suzuki et al.
patent: 4312816 (1982-01-01), Oketa et al.
patent: 4321212 (1982-03-01), Suzuki et al.

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