Tert-butyl 3-(1-acetylcyclopropyl)-2-diazo-3-oxopropanoate 、
苯乙炔 在
dirhodium(II) tetrakis[N-tetrachlorophthaloyl-(S)-tert-leucinate] bis(ethylacetate) 作用下,
以
三氟甲苯 为溶剂,
反应 1.0h,
生成 spiro[(1R,4S)-1-tert-butoxycarbonyl-4-methyl-6-phenyl-7-oxabicyclo[2.2.1]hept-5-en-2-one-3,1'-cyclopropane] 、 spiro[(1S,4R)-1-tert-butoxycarbonyl-4-methyl-6-phenyl-7-oxabicyclo[2.2.1]hept-5-en-2-one-3,1'-cyclopropane]