Benzenepropanoic acid,a-diazo-2-[(4-methoxy-2-butynyl)oxy]-3-methyl-b-oxo-, methyl ester 在
dirhodium(II) tetrakis[(S)-N-phthaloyl-tert-leucinate] 作用下,
以
甲苯 为溶剂,
反应 1.0h,
生成 (S)-methyl 2-(1-methoxybuta-2,3-dien-2-yl)-7-methyl-3-oxo-2,3-dihydrobenzofuran-2-carboxylate 、 (R)-methyl 2-(1-methoxybuta-2,3-dien-2-yl)-7-methyl-3-oxo-2,3-dihydrobenzofuran-2-carboxylate