| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject new compound obtained by the reaction of a specific benzopyranoisoxazolidine compound with a ketone and giving an optically active alcohol and carbonyl compound useful as a raw material for pharmaceuticals, agrochemicals, cosmetics, liquid crystals, etc., in high yield and selectivity. SOLUTION: This new alkylidenecarbonyl-substituted benzopyranoisoxazolidine compound is expressed by formula I [R<1> is H or an alkyl; R<2> and R<3> are each a (substituted) alkyl or R<2> and R<3> together with adjacent C atom form a (substituted) cycloalkylidene]. It is useful for the production of an optically active alcohol, aldehyde and ketone useful as a raw material for pharmaceuticals, agrochemicals, cosmetics, liquid crystal, etc., in high yield and selectivity. The compound can be produced by reacting a benzopyranoisoxazolidine compound expressed by formula II [R<4> is a (substituted) alkyl or a (substituted) aryl] with a ketone expressed by formula III. |
