A series of chiral spirocyclic cyclodipeptides of the general formula I was synthesized; the aim was to determine how the substitution of cyclobutane for cyclopentane in cyclo(-alanyl-1-amino-1-cyclopentanecarbonyl-) would influence the inhibition of the proliferative activity of the caudal morphogenic system (CMS) of Chick embryos. Spirocyclic cyclodipeptides Ia - Il were obtained by cyclization of linear dipeptides IIa - IIf, prepared by condensation of protected amino acids by DCCI method. The inhibition was investigated by the Chick Embryotoxicity Screening Test. The results show generally lower activity in the tested series, as compared with derivatives containing 1-amino-1-cyclopentanecarboxylic acid.
一系列手性螺环环二肽的一般公式为
I,目的是确定在环(-丙
氨酰-1-
氨基-1-
环戊烷羰基-)中用
环丁烷代替
环戊烷会如何影响对鸡胚胎尾部形态发生系统(CMS)增殖活性的抑制作用。螺环环二肽
Ia - Il通过线性二肽
IIa - IIf的环化制备而成,后者通过
DCCI方法使保护
氨基酸缩合而成。抑制作用通过鸡胚胎毒性筛选测试进行研究。结果显示,与含有1-
氨基-1-
环戊烷羧酸衍
生物相比,被测试系列中的活性普遍较低。