摘要:
Bu3SnH-mediated aryl radical cyclization of o-bromo-N-acryloylanilides 16 and 17 proceeded in a 5-exo manner exclusively to give, in high yields, oxindoles 3 and 4, the key intermediates for the synthesis of (+/-)-physostigmine and (+/-)-physovenine, respectively. (C) 2000 Elsevier Science Ltd. All rights reserved.