N-苄基马来酰亚胺 、
(3aR,4R,6aS)-2,2-dimethyl-5-oxido-4-(trityloxymethyl)-4,6a-dihydro-3aH-[1,3]dioxolo[4,5-c]pyrrol-5-ium 以
苯 为溶剂,
生成 、 (1S,2S,6R,7R,10S,14R)-12-benzyl-4,4-dimethyl-7-(trityloxymethyl)-3,5,9-trioxa-8,12-diazatetracyclo[6.6.0.02,6.010,14]tetradecane-11,13-dione