Enantioselective synthesis of 1-vinyltetrahydroisoquinolines via Pd-catalyzed intramolecular asymmetric allylic amination reactions
作者:Chih-Wei Chien、Ce Shi、Chi-Feng Lin、Iwao Ojima
DOI:10.1016/j.tet.2011.05.125
日期:2011.9
naturally occurring isoquinoline alkaloids. 1-Vinyl-6,8-dimethoxytetrahydroisoquinoline 4 and 1-vinyl-5,6,7-trimethoxytetrahydroisoquinoline 6 with >90% ee by means of Pd-catalyzed intramolecular asymmetric allylic amination reactions, using MPN and BOP ligands, developed in our laboratory. The fine-tuning capability of the MPN and BOP ligands has played a significant role in the optimization of enantioselectivity
1-乙烯基四氢异喹啉用作合成多种天然存在的异喹啉生物碱的通用中间体。1-乙烯基-6,8-二甲氧基四氢异喹啉4和1-乙烯基-5,6,7-三甲氧基四氢异喹啉6使用MPN和BOP配体,通过我们实验室开发的Pd催化的分子内不对称烯丙基胺化反应,可以得到ee> 90%的有机物。MPN和BOP配体的微调功能在优化对映选择性方面发挥了重要作用。观察到有趣的取代基效应以及溶剂效应对产物的选择性和对映选择性。提出了可能的机制,其可以适应各种发现,包括通过其与路易斯酸性Pd 2+金属中心的配位来激活三氟酰胺部分的至关重要性。