Synthesis and Opiate Activity of Pseudo-Tetrapeptides Containing Chiral Piperazin-2-one and Piperazine Derivatives.
作者:Tetsushi YAMASHITA、Eiji TSURU、Eri BANJYO、Matsumi DOE、Kozo SHIBATA、Masahide YASUDA、Munekazu GEMBA
DOI:10.1248/cpb.45.1940
日期:——
Enantiomeric piperazin-2-one derivatives, N, N'-ethylene-bridged alanylphenylalanines (1a or 1b), were synthesized using (S)- or (R)-alanine and phenylalanine as starting materials, and were inserted into the second and third positions of enantiomeric pseudo-tetrapeptides (P1a- or P1b-OEt). The corresponding piperazine derivatives (1a-or 1b-sRed) obtained by selective BH3 reduction of the amide carbonyl groups of 1a or 1b were similarly inserted into the same positions of tetrapeptides (P1a- and P1b-sRed). Enantiomeric N, N'-ethylene-bridged tyrosyltyrosine derivatives (2a or 2b) obtained from (S)- or (R)-tyrosine were also inserted into the first and second positions of two pairs of enantiomeric tetrapeptides (P2a- and P2b-OEt or P'2a- and P'2b-OEt). The opiate activities of the eight peptides thus obtained were studied by use of the mouse vas deferens and the guinea pig ileum assays in order to elucidate the structure-activity relationships of these peptides, especially with respect to stereochemistry.
合成了对映异构体哌嗪-2-酮衍生物,N, N'-乙烯桥联的丙氨酸苯丙氨酸(1a或1b),以(S)-或(R)-丙氨酸和苯丙氨酸作为起始材料,并将其插入对映异构体伪四肽(P1a-或P1b-OEt)的第二和第三位置。通过选择性BH3还原1a或1b的酰胺羰基得到的相应哌嗪衍生物(1a-or 1b-sRed)也同样插入到四肽(P1a-和P1b-sRed)的相同位置。由(S)-或(R)-酪氨酸获得的对映异构体N, N'-乙烯桥联的酪氨酸衍生物(2a或2b)也被插入到两对对映异构体四肽(P2a-和P2b-OEt或P'2a-和P'2b-OEt)的第一和第二位置。通过使用小鼠输精管和豚鼠回肠实验,对这八种肽的阿片活性进行了研究,以阐明这些肽的结构-活性关系,特别是关于立体化学的关系。