acid NCA , which seemed to be the most universal method. Most of the obtained “β-sultam peptides” were sensitive against humidity, they hydrolyzed forming sulfonic acids, and reactions with amines resulted in sulfonamides. Reactions of N -acylated products showed that the sulfonyl group was faster attacked than the imide structure.
1,2- Thiazetidine -3-
乙酸-1,1-二氧化物是 Ñ 使用bromoacetates烷基化,和 Ñ 使用任一酰
氯-acylated,保护的
氨基酸氟化物,或 ñ -保护
氨基酸 NCA ,这似乎是最通用方法。所获得的大多数“β-sultam肽”对湿度敏感,它们会
水解形成
磺酸,并且与胺反应会生成磺酰胺。 N- 酰化产物的反应 表明,磺酰基的攻击速度比
酰亚胺结构快。