Studies on neurokinin antagonists. 2. Design and structure-activity relationships of novel tripeptide substance P antagonists, N.alpha.-[N.alpha.-(N.alpha.-acetyl-L-threonyl)-N1-formyl-D-tryptophyl]-N-methyl-N-(phenylmethyl)-L-phenylalaninamide and its related compounds
作者:Daijiro Hagiwara、Hiroshi Miyake、Hiroshi Morimoto、Masako Murai、Takashi Fujii、Masaaki Matsuo
DOI:10.1021/jm00095a013
日期:1992.8
terms of potency and stability. Subsequent modification of the amino terminal into N alpha-acetyl-L-threonine led to the most potent compound, N alpha-[N alpha-(N alpha-acetyl-L-threonyl)-N1-formyl-D-tryptophyl]-N- methyl-N-(phenylmethyl)-L-phenylalaninamide [Ac-Thr-D-Trp(CHO)-Phe-NMeBzl (5a, FR113680)]. This compound 5a potently blocked 3H-SP binding to guinea pig lung membranes with IC50 of (5.8 +/-
继续研究先前报道的新型三肽SP拮抗剂Nα-[Nα-[Nα-(叔丁氧基羰基)谷氨酰胺基] -N1-甲酰基-D-色氨酸]苯丙氨酸苄酯[Boc-Gln- D-Trp-(CHO)-Phe-OBzl(1)]在本文中描述。我们最初研究了豚鼠血浆和肝脏匀浆中1的稳定性,以阐明结构中最不稳定的部分。结果表明,苄基酯部分易于水解以产生惰性酸类似物。因此,我们搜索了对水解酶更具抗性的苄基酯替代物。该方法发现了等价酰胺结构,N-甲基-N-(苯甲基)酰胺,其效力和稳定性均合适。随后将氨基末端修饰成Nα-乙酰基-L-苏氨酸导致了最有效的化合物Nα-[Nα-(Nα-乙酰基-L-苏氨酸)-N1-甲酰基-D-色氨酸] -N -甲基-N-(苯甲基)-L-苯丙氨酰胺[Ac-Thr-D-Trp(CHO)-Phe-NMeBzl(5a,FR113680)]。该化合物5a有效阻断3H-SP与豚鼠肺膜的结合,IC50为(5.8 +/-