Diastereoselective α-iodination reaction of 4-alkenylamide having a β-chiral center
摘要:
alpha-Iodination reaction of 4-alkenylamide with a beta-chiral center proceeds with high diastereoselectivity to give syn alpha-iodoalkenamide through the formation of cyclic ketene N,O-acetal and subsequent alpha-iodination from the opposite side of a beta-substituent. (C) 1997 Elsevier Science Ltd.
A novel and mild alpha-iodination of carboxamides was developed. Unsaturated amides could be converted to the alpha-iodoamides in moderate to good yields by treatment with I2 in the presence of s-collidine.