Phenacyl-triphenyl-arsonium 、
methyl 2,2,6-trimethyl-2H-pyran-5-carboxylate 在
potassium tert-butylate 作用下,
生成 (1R,2R,3R)-1-Acetyl-2-benzoyl-3-(2-methyl-propenyl)-cyclopropanecarboxylic acid methyl ester 、 (1R,2S,3S)-1-Acetyl-2-benzoyl-3-(2-methyl-propenyl)-cyclopropanecarboxylic acid methyl ester