重氮甲烷 、
(4R,4aR,7R,7aR)-4,7-Dimethyl-hexahydro-cyclopenta[c]pyran-1-one 生成 (1R,2R,5R)-2-((R)-1-Methoxycarbonyl-ethyl)-5-methyl-cyclopentanecarboxylic acid methyl ester 、 (1R,2R,5R)-2-((S)-1-Methoxycarbonyl-ethyl)-5-methyl-cyclopentanecarboxylic acid methyl ester 、