Asymmetric synthesis of furo[3,2-i]indolizines from L-malic acid
摘要:
A chiral enamide 6, derived from L-malic acid, was converted to furo-indolizine 2 via N-acyliminium ion cyclization. Furo-indolizine 2 was transformed to indolizine derivatives 8 and 9 which have a substituent at angular position. (C) 1999 Elsevier Science Ltd. All rights reserved.
Sequential 1,4- and 1,2-Addition Reactions to α,β-Unsaturated N-Acyliminium Ions: A New Strategy for the Synthesis of Spiro and Bridged Heterocycles
摘要:
Novel bicyclic and tetracyclic spirocycles and tricyclic bridged heterocyclic systems can be readily prepared from sequential 1,4- and 1,2-addition reactions of latent bis-nucleophiles to alpha,beta-unsaturated N-acyliminium ions.