Dynamic resolution of α-bromo and α-chloro acetamides in nucleophilic substitution with amine nucleophiles in the presence of TBAI has been investigated for stereoselective syntheses of tri- and tetrapeptide analogues. Mechanistic investigations suggest that primary pathway of the asymmetric induction is a dynamic kinetic resolution and real intermediate for the substitution is α-iodo acetamides. Also
对于三肽和四肽类似物的立体选择性合成,已经研究了在存在TBAI的情况下用
胺类亲核试剂进行亲核取代中的α-
溴和α-
氯乙酰胺的动态拆分。机理研究表明,不对称诱导的主要途径是动态动力学拆分,取代的真正中间产物是α-
碘乙酰胺。同样,证明了这种温和而简单的方法在N-羧烷基,N-
氨基烷基和N-羟烷基肽类似物的立体选择性制备中的应用。