作者:Anthony R. Haight、Gregory S. Wayne、Gregory S. Lannoye、Shyamal I. Parekh、Weijiang Zhang、Richard R. Copp、L. Steven Hollis
DOI:10.1021/jo980537j
日期:1998.8.1
impurity observed during the synthesis of zileuton (Zyflo) has been isolated and characterized as a benzo[b]thiophene derivative that has undergone electrophilic substitution in the 6 position (4). A nine-step synthesis confirms the structural assignment. Key steps in the synthesis include a regioselective Friedel-Crafts coupling between 2-hydroxythioanisole, 8, and 1-(benzo[b]thien-2-yl)ethanol, 1, and
已分离出合成齐留通(Zyflo)时观察到的杂质,并将其表征为已在6位(4)进行了亲电取代的苯并[b]噻吩衍生物。九步综合确认了结构分配。合成中的关键步骤包括在2-羟基硫代苯甲醚8和1-(苯并[b]噻吩-2-基)乙醇1之间进行区域选择性的Friedel-Crafts偶联,以及从邻位苯并[b]噻吩形成苯并[b]噻吩。甲硫基苯甲醛14和氯丙酮。该合成为取代的苯并[b]噻吩提供了潜在的通用途径。