Asymmetric synthesis of 2,5-disubstituted 3-hydroxypyrrolidines based on stereodivergent intramolecular iridium-catalyzed allylic aminations
作者:Yoshihiro Natori、Shunsuke Kikuchi、Takahiro Kondo、Yukako Saito、Yuichi Yoshimura、Hiroki Takahata
DOI:10.1039/c3ob42229a
日期:——
Intramolecular iridium-catalyzed allylic aminations of homochiral (E)-6-N-nosylaminohept-2-en-1-yl methyl carbonates were investigated. The relative position of the 2,5-substituents of the resulting pyrrolidines was found to be controlled by using both enantiomers (4 and 5) of the appropriate chiral ligand, demonstrating a simple and highly stereodivergent synthetic protocol. Selected trans- and cis-2,5-disubstituted 3-hydroxypyrrolidines (2a and 18a) were converted to (+)-bulgecinine (6) and (+)-preussin (7), respectively.
研究了分子内铱催化的同手性 (E)-6-N-nosylaminohept-2-en-1-yl 甲基碳酸酯的烯丙基胺化反应。研究发现,通过使用适当手性配体的两种对映体(4 和 5),可以控制所得吡咯烷的 2,5-取代基的相对位置,从而展示了一种简单而高度立体发散的合成方案。选定的反式和顺式-2,5-二取代 3-羟基吡咯烷(2a 和 18a)被分别转化为 (+)-bulgecinine (6) 和 (+)-preussin (7)。