Synthesis of substituted 3-(5-amino-[1,3,4]thiadiazol-2-yl)-2<i>H</i>-pyrano[2,3-<i>c</i>]pyridin-2-ones
作者:Irina O. Zhuravel'、Sergiy M. Kovalenko、Alexandre V. Ivachtchenko、Valentin P. Chernykh、Pavlo E. Shinkarenko
DOI:10.1002/jhet.5570410407
日期:2004.7
An efficient two-step synthesis of novel 3-(5-amino-[1,3,4]thiadiazol-2-yl)-2H-pyrano[2,3-c]pyridine-2-ones was developed. In the first step, a new 2H-pyrano[2,3-c]pyridine-3-carboxamide 5 was prepared by Knoevenagel condensation of pyridoxal hydrochloride with cyanoacetamide. In the second step, the reaction of carboxamide 5 with a series of N4-substituted thiosemicarbazides yielded a library of 35
开发了有效的两步合成新型3-(5-氨基-[1,3,4]噻二唑-2-基)-2 H-吡喃并[2,3 - c ]吡啶-2-酮。第一步,通过吡pyr醛盐酸盐与氰基乙酰胺的Knoevenagel缩合制备新的2 H-吡喃并[2,3 - c ]吡啶-3-甲酰胺5。在第二步中,羧酰胺5与一系列N 4取代的硫代氨基脲的反应以高收率产生了35种离散化合物8 1-35}的库。讨论了导致这些产物的分子间再循环机理。