Inhibitors of dihydropteroate synthase: substituent effects in the side-chain aromatic ring of 6-[[3-(aryloxy)propyl]amino]-5-nitrosoisocytosines and synthesis and inhibitory potency of bridged 5-nitrosoisocytosine-p-aminobenzoic acid analogs
作者:O. William Lever、Lawrence N. Bell、Clifton Hyman、H. Michael McGuire、Robert Ferone
DOI:10.1021/jm00155a014
日期:1986.5
6-amino substituents larger than methyl were detrimental to binding, although the adverse steric effect could be overcome by a positive ancillary binding contribution of a phenyl ring attached at the terminus of certain 6-alkylamino substituents. We selected the 6-[[3-(aryloxy)propyl]amino]-5-nitrosoisocytosine structure as a parent system and explored the effects of aromatic substituents on synthase
我们先前曾报道6-(甲基氨基)-5-亚硝基异胞嘧啶(5)是大肠杆菌二氢蝶呤合酶的有效抑制剂(I50 = 1.6 microM)。注意到大于甲基的6-氨基取代基不利于结合,尽管可以通过在某些6-烷基氨基取代基的末端连接的苯环的辅助辅助结合作用来克服不利的空间效应。我们选择6-[[[3-(芳氧基)丙基]氨基] -5-亚硝基异胞嘧啶结构作为母体系统,并探讨了芳香族取代基对合酶抑制的影响。芳基取代的性质会影响结合,如15种芳基类似物的30倍抑制力范围所示(I50值= 0.6-18 microM),尽管合酶抑制与芳基取代基的电子或疏水特性之间没有明显的相关性。为了探索这些抑制剂的芳环可能与底物对氨基苯甲酸(PABA)的合酶结合位点相互作用的可能性,合成了三种化合物,其中PABA类似物通过与氨基连接而桥接到亚硝基异胞嘧啶部分在异胞嘧啶的C-6上。与(芳氧基)丙基系列的其他成员相比,桥接的类似物显着抑制了合酶(I50值=