Synthesis of Benzoxazolylthiomethyl and Benzthiazolylthiomethyl Quinazolin-4(3<i>h</i>)-ones
作者:Mohammad Rafeeq、Chittireddy Venkata Ramana Reddy、Pramod Kumar Dubey
DOI:10.1080/10426507.2015.1025905
日期:2015.11.2
o-Aminophenol (1a, X = O) or o-aminothiophenol (1b, X = S) was reacted with carbon disulfide in ethanol containing KOH under reflux to obtain 2-mercaptobenzoxazole (2a, X = O) and 2-mercaptobenzthiazole (2b, X = S), respectively. Condensation of 2a and 2b each with chloroacetic acid gave 2-(benzoxazol-2-ylthio)acetic acid (3a, X = O) and 2-(benzthiazol-2-ylthio)acetic acid (3b, X = S) respectively which
图形摘要 摘要 邻氨基苯酚 (1a, X = O) 或邻氨基苯硫酚 (1b, X = S) 与二硫化碳在含有 KOH 的乙醇中回流反应,得到 2-巯基苯并恶唑 (2a, X = O) 和 2-分别为巯基苯并噻唑 (2b, X = S)。2a 和 2b 分别与氯乙酸缩合得到 2-(苯并恶唑-2-基硫基)乙酸(3a,X = O)和 2-(苯并噻唑-2-基硫基)乙酸(3b,X = S),其中邻氨基苯甲酰胺得到 2-((benzoxal-2-ylthio)methyl) quinazolin-4(3H)-one (5a, X = O) 和 2-((benzthiazol-2-ylthio)methyl)quinazolin-4(3H)-one (5b, X = S) 分别。产品 5a、b 可以通过其他三种途径制备,涉及一般序列 6→2→5、6→7→5 和 8→9→5。