2,4-Diamino-5-benzylpyrimidines as antibacterial agents. 4. 6-Substituted trimethoprim derivatives from phenolic Mannich intermediates. Application to the synthesis of trimethoprim and 3,5-dialkylbenzyl analogs
作者:Barbara Roth、Edward Aig、Kenneth Lane、Barbara S. Rauckman
DOI:10.1021/jm00179a012
日期:1980.5
The preparation of a wide variety of 6-substituted trimethoprim analogues was readily accomplished by the reaction of 2,4-diamino-6-substituted-pyrimidines with 2,6-dimethoxy-4-[(N,N-dimethylamino)methyl]phenol at 120--160 degrees C. The less reactive 2,6-dialkyl-4-[(N,N-dimethylamino)methyl]phenols reacted successfully with 2,4-diamino-6-(alkylthio)pyrimidines to give 5-(substituted benzyl)pyrimidines
通过2,4-二氨基-6-取代的嘧啶与2,6-二甲氧基-4-[(N,N-二甲基氨基)甲基]苯酚的反应可轻松完成多种6-取代的甲氧苄啶类似物的制备较低反应性的2,6-二烷基-4-[(N,N-二甲基氨基)甲基]酚与2,4-二氨基-6-(烷硫基)嘧啶成功反应生成5-(取代的苄基)嘧啶。当在嘧啶环中存在非反应性6-取代基时,产物的酚基以高产率烷基化。用阮内镍很容易除去6-(烷硫基)基团。因此从其6-(甲硫基)对应物以高收率获得甲氧苄啶。6-取代的甲氧苄啶类似物作为大肠杆菌二氢叶酸还原酶的抑制剂和抗菌剂均具有较低的活性。