Catalytic Asymmetric 6π Electrocyclization: Enantioselective Synthesis of Functionalized Indolines

被引:49
|
作者
Maciver, Eleanor E. [1 ]
Thompson, Sam [1 ]
Smith, Martin D. [1 ]
机构
[1] Univ Oxford, Chem Res Lab, Oxford OX1 3TA, England
基金
英国工程与自然科学研究理事会;
关键词
asymmetric catalysis; electrocyclization; organocatalysis; phase transfer; torquoselectivity; MANNICH-TYPE REACTION; X=Y-ZH SYSTEMS; STEREOSELECTIVE-SYNTHESIS; LEWIS-ACID; POTENTIAL 1,3-DIPOLES; NAZAROV CYCLIZATION; RING-CLOSURE; 1,5-ELECTROCYCLIZATION; CYCLOHEXENONES; DERIVATIVES;
D O I
10.1002/anie.200905169
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
(figure represented) How to close a ring: An approach to catalytic asymmetric 6π electrocyclization leads to a highly enantioselective process that was used in the synthesis of chiral indolines (see scheme). Treatment of N-aryl imines under phase transfer conditions in the presence of N-benzyl cinchonidinium chloride generates a delocalized 2-aza-pentadienyl anion system that cyclizes in up to 99% yield and 98% ee. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA.
引用
收藏
页码:9979 / 9982
页数:4
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