乙烯基乙醚 、
(E)-4-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-2-oxo-but-3-enoic acid (1R,2S,5R)-2-isopropyl-5-methyl-cyclohexyl ester 以
二氯甲烷 为溶剂,
生成 (4R,6R)-4-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-6-ethoxy-5,6-dihydro-4H-pyran-2-carboxylic acid (1R,2S,5R)-2-isopropyl-5-methyl-cyclohexyl ester 、 (4R,6S)-4-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-6-ethoxy-5,6-dihydro-4H-pyran-2-carboxylic acid (1R,2S,5R)-2-isopropyl-5-methyl-cyclohexyl ester 、 (4S,6R)-4-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-6-ethoxy-5,6-dihydro-4H-pyran-2-carboxylic acid (1R,2S,5R)-2-isopropyl-5-methyl-cyclohexyl ester 、 (4S,6S)-4-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-6-ethoxy-5,6-dihydro-4H-pyran-2-carboxylic acid (1R,2S,5R)-2-isopropyl-5-methyl-cyclohexyl ester