An efficient and highly diastereoselective synthesis of 2-substituted benzo[b]azepin-5-ol via stereocontrolled addition of Grignard reagents to oxa-bridged benzazepines has been developed. The reaction proceeds efficiently starting from versatile skeletons with mild reaction conditions as well as simple operation. Furthermore, 2-substituted benzazepinones could been obtained by simple Dess–Martin oxidation
已经开发出通过将格氏试剂立体控制地添加到氧杂桥联苯并氮杂来高效且高度非对映选择性地合成 2-取代苯并[ b ]azepin-5-ol 。该反应从具有温和反应条件和简单操作的多功能骨架开始有效地进行。此外,2-取代的苯并氮杂酮可以通过简单的 Dess-Martin 氧化以优异的收率获得。
A Cascade of Acid-Promoted C–O Bond Cleavage and Redox Reactions: From Oxa-Bridged Benzazepines to Benzazepinones
作者:Yuewei Zhang、Fengzhi Yang、Lianyou Zheng、Qun Dang、Xu Bai
DOI:10.1021/ol502971e
日期:2014.12.5
A sequence of C–O bond cleavage and redox reactions in oxa-bridged azepines was realized under acid promoted conditions. This protocol provides an atom-economical and straightforward approach to access benzo[b]azepin-5(2H)-ones in high yields. The formal synthesis of tolvaptan was achieved by exploiting this new transformation.
在酸促进的条件下,在氧杂桥联的ze庚烷中实现了一系列的C–O键断裂和氧化还原反应。该协议提供了一种原子经济且直接的方法,可以高产率获得苯并[ b ] azepin-5(2 H)-。托伐普坦的正式合成是通过利用这一新的转化而实现的。