Study of chiral auxiliaries for the intramolecular [2+2] cycloaddition of a keteniminium salt to an olefinic double bond. A new asymmetric synthesis of cyclobutanones.
作者:Lian-yong Chen、Léon Ghosez
DOI:10.1016/s0040-4039(00)97650-0
日期:1990.1
ω-Unsaturated amides derived from chiral pyrrolidines can be readily converted into keteniminium salts which undergo intramolecular [2+2] cycloaddition to yield chiral cyclobutanones. Amides derived from 2,5-dimethylpyrrolidine give the best yields and high facial selectivities.
衍生自手性
吡咯烷的ω-不饱和酰胺可以很容易地转化成酮
亚胺盐,该酮
亚胺盐经过分子内[2 + 2]环加成反应生成手性
环丁酮。衍生自2,5-二甲基
吡咯烷的酰胺具有最佳的收率和较高的面部选择性。