A Mild and Highly Chemoselective .alpha.-Iodination of N-Allylic Carboxamides and Lactams
摘要:
Mild and highly chemoselective alpha-iodination reactions of N-allylic carboxamides and lactams are reported. N-Allylic amides and lactams reacted with I-2 and 2,6-lutidine at room temperature to give alpha-iodo amides and lactams in moderate to good yields. The exclusive alpha-iodination of N-allylic amides having another acidic hydrogen in the molecule proceeded under these conditions. The iodides obtained were converted to the bicyclic lactam or the beta-lactam derivatives with high stereoselectivity by a radical iodine atom-transfer reaction or a nucleophilic substitution reaction.