Side reactions were encountered during the coupling of 3-amino-2,2-dimethylpropionic acid (β-Api) derivatives, some of which could be directly ascribed to steric hindrance at the carboxy-group. Protected and deprotected tri- and hexa-peptides were prepared using dicyclohexylcarbodi-imide and hydroxybenzotriazole. Alternative procedures employing oxazin-6-ones were not as useful as expected.
在3-
氨基-2,2-二甲基
丙酸(β-Api)衍
生物偶联过程中遇到了副反应,其中一些可以直接归因于羧基的位阻。使用二环己基碳二
亚胺和
羟基苯并三唑制备受保护和脱保护的三肽和六肽。使用oxazin-6-ones的替代程序没有预期的有用。