Asymmetric addition of 3-substituted benzofuran-2-ones to isatin N-Boc ketimines catalyzed by chiral biscinchona alkaloid catalyst
摘要:
A highly enantioselective Mannich reaction of 3-substituted benzofuran-2(3H)-ones and isatin N-Boc ketimines catalyzed by a chiral biscinchona alkaloid catalyst was developed, which proved to be an efficient way for the synthesis of chiral 3,3'-disubstituted benzofuran-2-one derivatives. The nucleophilic addition products were generally obtained in high yields (up to 99%) with very good diastereoselectivities (up to >95:5 dr) and enantioselectivities (up to 98% ee). (C) 2015 Elsevier Ltd. All rights reserved.
P-Spiro phosphonium salts catalyzed asymmetric fluorination of 3-substituted benzofuran-2(3H)-ones
作者:Chuan-Le Zhu、Xiao-Yun Fu、Ai-Jia Wei、Dominique Cahard、Jun-An Ma
DOI:10.1016/j.jfluchem.2013.03.007
日期:2013.6
Asymmetric electrophilic fluorination of 3-substituted benzofuran-2(3H)-ones was realized under liquid–liquid phase-transfer catalysis with 2 mol% of chiral phosphoniumsalts to afford the fluorinated products with up to 96% yield and 56% ee.
的非对称电氟化3-取代的苯并呋喃-2(3 H ^) -酮的混合物在液-液相转移催化实现了与2摩尔%的手性鏻盐,得到氟化产物与高达96%的收率和56%ee的。