Efficient Method for Synthesis of 2-Acetylbenzo(b)thiophene and Its Derivatives, the Key Synthons for 5-Lipoxygenase Inhibitors
作者:Sanjay R. Chemburkar、David G. Anderson、Rajarathnam E. Reddy
DOI:10.1080/00397910903162775
日期:2010.6.16
tert-butylmercaptan (6) to form 2-(tert-butylthio)benzaldehyde (7a), which upon treatment with HBr in water gave the disulfide derivative 2,2′-disulfanediyldibenzaldehyde (8a) in 97% yield. Finally, the reaction of 8a with acetylacetone (9) and 1-chloroacetone (10) gave 2-acetylbenzo(b)thiophene (2a) in 94% yield. The methodology is general and suitable for the preparation of its derivatives, 2b–d.
开发了一种有效的方法来合成 2-乙酰苯并 (b) 噻吩 (2a),这是齐留通 (1) 的关键中间体。合成包括用叔丁硫醇 (6) 处理 2-氯苯甲醛 (5a) 以形成 2-(叔丁硫基) 苯甲醛 (7a),在水中用 HBr 处理后得到二硫化物衍生物 2,2'-二硫烷二基二苯甲醛 (8a) ) 的产率为 97%。最后,8a 与乙酰丙酮 (9) 和 1-氯丙酮 (10) 的反应以 94% 的产率得到 2-乙酰苯并 (b) 噻吩 (2a)。该方法是通用的,适用于其衍生物 2b-d 的制备。