Synthesis of benz[5,6]azepino[4,3-b]indoles by 1,7-electrocyclisation of azomethine ylides
摘要:
A new, general route to the benz[5,6]azepino[4,3-b]indole ring system has been developed via the 1.7-dipolar electrocyclisation reactions of azomethine ylides derived from easily available 3-formyl indole derivatives. The intermediacy of azomethine ylides vas shown by the trapping of the proposed alpha, beta: gamma, delta-conjugated dipole with N-phenylmaleimide. (C) 2004 Elsevier Ltd. All rights reserved.
Chiral Phosphoric Acid Catalyzed Intramolecular Dearomative Michael Addition of Indoles to Enones
作者:Yong Zhou、Zi-Lei Xia、Qing Gu、Shu-Li You
DOI:10.1021/acs.orglett.6b03610
日期:2017.2.17
An enantioselective intramolecular dearomative Michaeladdition of indolyl enones is presented. In the presence of catalytic amount of chiral phosphoric acid, various enantioenriched spiro-indolenines bearing a quaternary stereogenic center were obtained with good yields and enantioselectivity (up to 97% ee) under mild reaction conditions.
A new, general route to the benz[5,6]azepino[4,3-b]indole ring system has been developed via the 1.7-dipolar electrocyclisation reactions of azomethine ylides derived from easily available 3-formyl indole derivatives. The intermediacy of azomethine ylides vas shown by the trapping of the proposed alpha, beta: gamma, delta-conjugated dipole with N-phenylmaleimide. (C) 2004 Elsevier Ltd. All rights reserved.