rac. trans-2,3,4,5-Tetrahydro-3-methansulfonyloxy-4,4,3',4'-tetramethyl-5-oxo-2,2'-dipyrrylmethan-5'-carbonsaeure-tert-butylester 在
sodium 作用下,
以
乙醇 为溶剂,
反应 0.25h,
以42%的产率得到(Z)-1,3,4,5-Tetrahydro-4,4,3',4'-tetramethyl-5-oxo-2,2'-pyrromethen-5'-carbonsaeure-tert-butylester