1-(tert-butyl) 2-methyl (S,Z)-3-((dimethylamino)methylene)-4-oxopyrrolidine-1 ,2-dicarboxylate 、
(2-(1,3-dioxolan-2-yl)ethyl)magnesium bromide 以
四氢呋喃 为溶剂,
以75%的产率得到(S,E)-1-tert-butyl 2-methyl 3-(3-(1,3-dioxolan-2-yl)propylidene)-4-oxopyrrolidine-1,2-dicarboxylate