4-cyclopent-3-enyl-2-diazo-3-oxo-butyric acid 2-oxo-1-phenyl-2-pyrrolidin-1-yl-ethyl ester 在
Rh
2[(N-(4-dodecylphenyl)sulfonyl)-(S)-prolinate]4 作用下,
以
二氯甲烷 为溶剂,
以61%的产率得到2-oxo-1,2,3,3a,4,6a-hexahydro-pentalene-1-carboxylic acid 2-oxo-1-phenyl-2-pyrrolidin-1-yl-ethyl ester