Unprecedented SnCl2·2H2O-mediated intramolecular cyclization of nitroarenes via C–N bond formation: a new entry to the synthesis of cryptotackieine and related skeletons
作者:Sunil Sharma、Bijoy Kundu
DOI:10.1016/j.tetlet.2008.09.154
日期:2008.12
A mild, efficient, and one-pot protocol for the intramolecular cyclization of 2-substituted nitroarenes via C-N bond formation using SnCl2 center dot 2H(2)O is described. The versatility of the method has been demonstrated by synthesizing two sets of polycyclic structures based oil privileged structures of indole and pyrrole, and of the alkaloid cryptotackieine associated with antimalarial activity. Our new approach provides a powerful entry into polycyclic structures related to an alkaloid. (c) 2008 Elsevier Ltd. All rights reserved.
A Concise Synthesis of 6H-Indolo[2,3-b]quinolines: Formal Synthesis of Neocryptolepine
作者:Santosh Tilve、Hari Kadam、Prakash Parvatkar
DOI:10.1055/s-0031-1290812
日期:2012.5
A new two-step approach for the synthesis of 6H-indolo[2,3-b]quinolines is described using indole C3 alkylation and a one-pot reduction-cyclization-aromatization sequence. The synthesis of the parent 6H-indolo[2,3-b] quinoline system constitutes a formal synthesis of the alkaloid neocryptolepine (cryptotackieine).