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7552971 
Journal Article 
A NEW CHEMOENZYMATIC ENANTIOSELECTIVE SYNTHESIS OF OPTICALLY-ACTIVE BENZOTHIOPYRAN AND BENZOTHIAZEPIN RING-SYSTEM 
Dike, SY; Ner, DH; Kumar, A 
1991 
Synlett
ISSN: 0936-5214
EISSN: 1437-2096 
443-444 
A simple enantiocontrolled synthesis of (R)-2-methyl-2,3-dihydro-4H-[1]benzothiopyran-4-one and (R)-2-methyl-2,3-dihydro-1,5-benzothiazepin-4(5H)-one starting from ethyl (S)-3-hydroxybutyrate is described.