Regioselective monochloro substitution in carbohydrates and non-sugar alcohols via Mitsunobu reaction: applications in the synthesis of reboxetine
作者:Abdul Rouf Dar、Mushtaq A. Aga、Brijesh Kumar、Syed Khalid Yousuf、Subhash Chandra Taneja
DOI:10.1039/c3ob40853a
日期:——
A regioselective high yielding monochloro substitution (chlorohydrin formation) via Mitsunobu reaction is reported. In carbohydrates and sterically hindered non-sugars, only the primary hydroxyl group is chlorinated, whereas in the non-sugar 1,2- and 1,3-alcohols, predominantly the secondary chloride substitution occurs. The versatile methodology provides indirect access to epoxides with the retention
据报道通过Mitsunobu反应的区域选择性高产一氯取代(氯醇形成)。在碳水化合物和受阻位的非糖中,仅伯羟基被氯化,而在非糖1,2-和1,3-醇中,主要发生仲氯取代。与常规的Mitsunobu反应可逆生成环氧化物的方法不同,通用的方法可在保留结构的情况下间接获得环氧化物。该方法已成功用作抗抑郁药光学活性非对映异构体合成的关键步骤瑞波西汀(R)-2,3- O-环己叉基-D-甘油醛的总产率为〜43%。