lycyl-glycyl-glykolyl-glycyl respectively. The «monomers» of this doubling reaction obviously cannot associate via H-bridges according to Fig. 1 during the reaction, an association according to Fig. 12 could, however, be envisaged as working hypothesis. Steric hindrance seems to play an eminent rôle in the cyclization of tripeptides to cyclo-hexapeptides.
综述了在小肽环化过程中引起加倍反应的各种因素。为了测试它们的相对重要性,三肽Gly-Pro-Gly的衍
生物和单癸二肽glycyl-glycolyl-glycyl的衍
生物已进行环化:两者都进行了加倍反应以生成环-glycyl-L-脯
氨酰-甘
氨酰-甘
氨酰-L-脯
氨酰基-甘
氨酰和环-甘
氨酰-甘
氨酰-甘
氨酰-甘
氨酰-甘
氨酰-甘
氨酰。该加倍反应的“单体”在反应过程中显然不能经由图1的H-桥缔合,然而,可以将根据图12的缔合设想为工作假设。立体障碍似乎在三肽环化成环六肽的过程中起着重要作用。