Benzoic acid (2S,6S,9S)-8,9-dimethyl-4-oxo-1,7-dioxa-spiro[5.5]undec-2-ylmethyl ester 在
sodium tetrahydroborate 作用下,
以
乙二醇二甲醚 为溶剂,
生成
Benzoic acid (2S,4S,6S,8R,9S)-4-hydroxy-8,9-dimethyl-1,7-dioxa-spiro[5.5]undec-2-ylmethyl ester 、 Benzoic acid (2S,4S,6S,8S,9S)-4-hydroxy-8,9-dimethyl-1,7-dioxa-spiro[5.5]undec-2-ylmethyl ester