methyl 2-diazo-3-[3-methyl-2-(2-pentynyloxy)phenyl]-3-oxopropionate 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 7-methyl-3-oxo-2-(penta-1,2-dien-3-yl)-2,3-dihydrobenzofuran-2-carboxylate 、 (R)-3-methyl 7-methyl-3-oxo-2-(penta-1,2-dien-3-yl)-2,3-dihydrobenzofuran-2-carboxylate