A Brønsted Acid Catalyzed Cascade Reaction for the Conversion of Indoles to α‐(3‐Indolyl) Ketones by Using 2‐Benzyloxy Aldehydes
作者:Ankush Banerjee、Modhu Sudan Maji
DOI:10.1002/chem.201902268
日期:2019.9.2
A Brønsted acid catalyzed, operationally simple, scalable route to several functionalized α-(3-indolyl) ketones has been developed and the long-standing regioisomeric issue has been eliminated by choosing appropriate carbonyls. A readily available and cheap bottle reagent was used as the catalyst. This protocol was also applicable to the synthesis of densely functionalized α-(3-pyrrolyl) ketones. A
已经开发出布朗斯台德酸催化的,操作简单的,可扩展的途径,以合成多种官能化的α-(3-吲哚基)酮,并且通过选择合适的羰基化合物消除了长期存在的区域异构问题。使用容易获得且便宜的瓶试剂作为催化剂。该方案也适用于高密度官能化的α-(3-吡咯基)酮的合成。详细的机理研究证实烯醇醚作为反应中间体。几种后合成修饰以及易于获得的β-咔啉,色胺,色胺醇和螺吲哚烯碱都证明了这种功能强大的构件的合成效用。基于这一概念,通过级联环化策略构建了功能化的咔唑。