Approaches to the Synthesis of (±)-Strychnine via the Cobalt-Mediated [2 + 2 + 2] Cycloaddition: Rapid Assembly of a Classic Framework
作者:Michael J. Eichberg、Rosa L. Dorta、Douglas B. Grotjahn、Kai Lamottke、Martin Schmidt、K. Peter C. Vollhardt
DOI:10.1021/ja016333t
日期:2001.9.1
Five synthetic approaches to racemic strychnine (1), with the cobalt-mediated [2 + 2 + 2] cycloaddition of alkynes to indoles as the key step, are described. These include the generation and attempted cyclization of macrocycle 8 and the synthesis of dihydrocarbazoles 15, 22, and 26 and their elaboration to pentacyclic structures via a conjugate addition, dipolarcycloaddition, and propellane-to-spirofused
Synthesis of 1,1-disubstituted tetrahydro-β-carbolines from 2-methyleneaziridines
作者:Peter M. Mumford、Jason J. Shiers、Gary J. Tarver、Jerome F. Hayes、Michael Shipman
DOI:10.1016/j.tetlet.2008.03.095
日期:2008.5
Ring opening of indole functionalised methyleneaziridines (3a-c, 7) with alcohols in the presence of boron trifluoride etherate leads to the formation of 1,1-disubstituted tetrahydro-beta-carbolines in moderate to good yields (37-83%). (c) 2008 Elsevier Ltd. All rights reserved.