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 Michaeladdition 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