Facile synthesis of chiral 2-amino-4-(indol-3-yl)-4H-chromene derivatives using thiourea as the catalyst
摘要:
The enantioselective Friedel-Crafts alkylation of indoles with iminochromenes catalyzed by a bifunctional thiourea organocatalyst was investigated. This reaction afforded chiral functionalized 2-amino-4-(indol-3-yl)-4H-chromenes in good yields (up to 87% yield) and with moderate to good enantioselectivities (up to 86% ee). (C) 2013 Elsevier Ltd. All rights reserved.
Organocatalytic conjugate addition promoted by multi-hydrogen-bond cooperation: access to chiral 2-amino-3-nitrile-chromenes
作者:Wenjun Li、Jiayao Huang、Jian Wang
DOI:10.1039/c2ob27102h
日期:——
A new efficient enantioselective conjugate addition strategy has been disclosed to rapidly construct 2-amino-3-nitrile-chromene complexes via a multi-hydrogen-bond cooperative activation model.
N-Heterocyclic carbene-catalysed homoenolate addition reaction to 3-cyano-2-imino-2<i>H</i>-chromenes: synthesis of C<sub>4</sub>-functionalized 2-amino-3-cyano-4<i>H</i>-chromene
作者:Pushpendra Mani Shukla、Aniruddh Pratap、Biswajit Maji
DOI:10.1039/d2ob01447e
日期:——
A diastereoselective N-heterocyclic carbene-catalysed reaction between enal and 3-cyano-2-imino-2H-chromene is described for accessing a new type of C4-functionalized 2-amino-3-cyano-4H-chromene. A wide variety of enals and iminochromenes afforded the desired homoenolate addition product 2-amino-4H-chromenes in good yields and with moderate to good diastereoselectivities.
描述了烯醛和 3-cyano-2-imino-2 H -chromene之间的非对映选择性 N-杂环卡宾催化反应以获得新型 C 4 -功能化 2-amino-3-cyano-4 H -chromene。各种各样的烯醛和亚氨基色烯以良好的产率和中等至良好的非对映选择性提供所需的均烯醇化物加成产物 2-amino-4 H-色烯。