methyl (1'S,4R,4'R,5R,6'R)-6'-(benzenesulfonyl)-4,5-diphenylspiro[1,3-dioxolane-2,5'-7-azabicyclo[2.2.1]hept-2-ene]-7'-carboxylate 在
silica gel 作用下,
以
正己烷 、
乙酸乙酯 为溶剂,
生成 methyl (1'S,4R,4'R,5R,6'S)-6'-(benzenesulfonyl)-4,5-diphenylspiro[1,3-dioxolane-2,5'-7-azabicyclo[2.2.1]hept-2-ene]-7'-carboxylate