Synthesis of 3-Substituted Pyrido[1,2-a]pyrimidinethylidenehydrazinylthiozole Derivatives from Pyridine-2-amines
作者:P. Venkateswarlu、P.K. Dubey
DOI:10.14233/ajchem.2017.20678
日期:——
Synthesis of 3-substituted thiazole pyrido[1,2-a]pyrimidines from 3-acetyl-4H-pyrido[1,2-a]pyrimidin-4-one condensed with thiosemicarbazide at mild condition. The effect of acetyl group in 3-acetyl-4H-pyrido[1,2-a]pyrimidin-4-one and the nucleophilicity of the nitrogen atoms in thiosemicarbazide, examining the reactions addition by the intramolecular cyclo-addition of phenacyl bromide, dimethylacetylenedicarboxylate (DMAD), chloroacetic acid under different conditions and solvents.
从3-乙酰基-4H-吡啶[1,2-a]嘧啶-4-酮与硫代氨基脲在温和条件下缩合合成3-取代的噻唑吡啶[1,2-a]嘧啶。研究了3-乙酰基-4H-吡啶[1,2-a]嘧啶-4-酮中乙酰基的影响以及硫代氨基脲中氮原子的亲核性,考察了苯乙基溴、二甲基乙炔二羧酸(DMAD)、氯乙酸在不同条件和溶剂下的加成反应。