A Cascade Reaction of Cinnamyl Azides with Acrylates Directly Generates Tetrahydro-Pyrrolo-Pyrazole Heterocycles
作者:Angela S. Carlson、En-Chih Liu、Joseph J. Topczewski
DOI:10.1021/acs.joc.0c00535
日期:2020.5.1
Developing reactions to generate complex and modular building blocks in a concise and direct fashion remains a contemporary synthetic challenge. This work describes a stereoselective cascade reaction between allylic azides and acrylates that directly generates tetrahydro-pyrrolo-pyrazole ring systems. These products contain up to four contiguous stereocenters, two of which may be tetrasubstituted carbon
发展反应以简洁,直接的方式生成复杂的模块化构建模块仍然是当代的综合挑战。这项工作描述了烯丙基叠氮化物和丙烯酸酯之间的立体选择性级联反应,该反应直接生成四氢-吡咯并-吡唑环系统。这些产物包含多达四个连续的立体中心,其中两个可以是连接至氮原子的四取代的碳原子。提供了30多个示例,平均分离产率为71%(范围从40%到94%)。该反应易于规模化以使用多于一克的起始原料,并且产物可以容易地多样化。