Synthesis of cis-2,5-disubstituted pyrrolidines via diastereoselective reduction of N-acyl iminium ions
作者:Alexander C Rudolph、Rainer Machauer、Stephen F Martin
DOI:10.1016/j.tetlet.2004.04.122
日期:2004.6
A new procedure for forming cis-2,5-disubstituted pyrrolidines having unsaturated side chains has been developed that features the diastereoselective reduction of N-acyl iminium ions, which were formed in situ by acid-catalyzed cyclizations of unsaturated γ-keto carbamates, with triphenylsilane. The sequence was applied to a very concise synthesis of 16, a subunit in the nonpeptide cholecystokinin
已经开发出形成具有不饱和侧链的顺式-2,5-二取代的吡咯烷的新方法,其特征在于通过酸催化不饱和γ-酮氨基甲酸酯的环化反应原位形成的N-酰基亚氨基离子的非对映选择性还原。三苯基硅烷。将该序列应用于非常简洁的16合成,该合成是非肽胆囊收缩素拮抗剂(+)-RP-66803中的一个亚基。