Starting from the chiral pyrrolidin-2-one 2, the carboxy group at C-4 underwent homologation, and subsequent removal of the 1-(4-methoxyphenyl)ethyl group gave lactam 6. Alkylation of N-1 with benzyl bromoacetate led to 7, a new conformationally restricted analogue of the dipeptide EG (Glu-Gly). The usefulness of 7 was demonstrated by its eventual conversion into 8, an orthogonally protected analogue
从手性 pyrrolidin-2-one 2 开始,C-4 处的羧基进行同系化,随后去除 1-(4-
甲氧基苯基)乙基得到内酰胺 6。N-1 用
溴乙酸苄酯烷基化得到 7 ,一种新的二肽
EG(Glu-Gly)的构象限制类似物。7 的有用性通过其最终转化为 8(一种正交保护的
生物活性三肽 F
EG 类似物)得到证明。为了提供去除保护基团后从 8 获得的新模拟物 9 的
生物活性,通过详细的构象分析和与 F
EG (1) 的比较来确定 9 的构象偏好。(© Wiley-
VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)