OPTICALLY ACTIVE 1,4-BENZODIOXINE-2-CARBOXYLIC ACID DERIVATIVES AND PROCESS FOR PRODUCING THE SAME

摘要

Optically active alcohols represented by general formulae (I, II) which are useful as intermediates in the synthesis of (RRR)-optical isomers of 1,4-benzooxine-2-carboxylic acid derivatives which are useful as preventives and remedies for diabetes, obesity, etc. A process for efficiently producing at a high yield (RRR)-optical isomers of 1,4-benzooxine-2-carboxylic acid derivatives starting with the above optically active alcohols via compounds of general formulae (V, VII). In said formulae, R represents (R)-1-phenylethylamino or (S)-1-phenylethylamino; Y represents halogeno, C1-4 alkylsulfonyl or arylsulfonyl; and R2 and R3 represent each hydrogen or a substituent such as alkyl, or R2 and R3 together represent -OCH2O-.