3-[(1S,3R)-3-(2-Diazo-acetoxy)-1-methyl-butoxy]-benzoic acid methyl ester 在
tetrakis(trifluoroacetato)rhodium(II) 作用下,
以
二氯甲烷 为溶剂,
生成 (7S,9R,11aS)-7,9-Dimethyl-11-oxo-8,9,11,11a-tetrahydro-7H-6,10-dioxa-cycloheptacyclooctene-4-carboxylic acid methyl ester 、 (7S,9R,11aS)-7,9-Dimethyl-11-oxo-8,9,11,11a-tetrahydro-7H-6,10-dioxa-cycloheptacyclooctene-2-carboxylic acid methyl ester