Syntheses of aza and fluorine-substituted 3-(piperidin-4-yl)-4,5-dihydro-1H-benzo[d][1,3]diazepin-2(3H)-ones
作者:Xiaojun Han、Rita L. Civiello、Stephen E. Mercer、John E. Macor、Gene M. Dubowchik
DOI:10.1016/j.tetlet.2008.11.012
日期:2009.1
A practical and expedient synthesis of the title compounds is described. They were prepared by Stille reaction of nitro halopyridines 4 or nitro fluro-halobenzenes 10, followed by Michael addition of tert-butyl 4-aminopiperidine-1-carboxylate to the resulting activated vinyl compounds 5 and 11, hydrogenation (–NO2→–NH2), cyclic urea formation, Boc removal, and HCl salt formation. However, N3 and F1
描述了标题化合物的实用且方便的合成。它们是通过硝基卤代吡啶4或硝基氟卤代苯10的Stille反应,然后将4-氨基哌啶-1-羧酸叔丁酯迈克尔加成到活化的乙烯基化合物5和11中,氢化反应制得的(-NO 2 →-NH 2),形成环状脲,去除Boc和形成HCl盐。但是,这种通用策略无法制造N3和F1类似物。活化的乙烯基化合物5A和5D当与反应叔4-氨基哌啶-1-羧酸丁酯在所需的迈克尔加成阶段没有停止;但是继续产生了azaindolines 8和9。化合物11d并未发生迈克尔加成反应; 相反,氟原子被置换了。