Conformationally defined adrenergic agents. 13. Conformational and steric aspects of the inhibition of phenylethanolamine N-methyltransferase by benzylamines
作者:Gary L. Grunewald、Daniel J. Sall、James A. Monn
DOI:10.1021/jm00397a029
日期:1988.2
about this ring system. Substitution by a methyl group on either benzylic position of THIQ results in diminished activity as a PNMT inhibitor; however, 3-methyl-THIQ shows enhanced activity as an inhibitor vs THIQ itself. Full conformational restriction of the BA side chain in analogues 4-8 results in a dramatic loss in inhibitor potency. We attribute this effect to a negative steric interaction between
苄胺(BA)类化合物是苯乙醇胺N-甲基转移酶的有效抑制剂(PNMT,EC 2.1.1.28)。通过将氨基甲基侧链掺入1,2,3,4-四氢异喹啉(THIQ)或2,3,4,5-四氢-1H-2-苯并)庚因(THBA)中,限制了氨基甲基侧链的效力作为抑制剂,表明在BA与活性位点结合中的构象作用;但是,这些环系统仍然保持高度的灵活性。我们合成了一系列由苄基胺构象定义的类似物,以探讨该类配体对PNMT抑制的构象影响以及空间体积的影响。此外,1,3,合成了4-甲基取代的THIQ和4-甲基取代的THIQ,并作为该环系统的空间体积耐受性的灵活模型进行了评估。在THIQ的任一苄基位置上被甲基取代会降低作为PNMT抑制剂的活性;然而,相对于THIQ本身,3-甲基-THIQ作为抑制剂表现出增强的活性。类似物4-8中BA侧链的完全构象限制导致抑制剂效力的显着损失。我们将此效应归因于杂环系统上方(或下方)的烷基桥接单