重氮乙烷 、
2-((E)-4-Methyl-7-phenyl-hept-4-enyl)-malonic acid 在
copper diacetate 、 manganese triacetate 作用下,
生成 (1R,5S,8S)-5-Methyl-7-oxo-8-phenethyl-6-oxa-bicyclo[3.2.1]octane-1-carboxylic acid ethyl ester 、 (1R,5S,8R)-5-Methyl-7-oxo-8-phenethyl-6-oxa-bicyclo[3.2.1]octane-1-carboxylic acid ethyl ester