Synthesis of Small 3-Fluoro- and 3,3-Difluoropyrrolidines Using Azomethine Ylide Chemistry
作者:Indrawan McAlpine、Michelle Tran-Dubé、Fen Wang、Stephanie Scales、Jean Matthews、Michael R. Collins、Sajiv K. Nair、Mary Nguyen、Jianwei Bian、Luis Martinez Alsina、Jianmin Sun、Jiaying Zhong、Joseph S. Warmus、Brian T. O’Neill
DOI:10.1021/acs.joc.5b00853
日期:2015.7.17
Here, we report accessing small 3-fluoropyrrolidines and 3,3-difluoropyrrolidines through a 1,3-dipolar cycloaddition with a simple azomethine ylide and a variety of vinyl fluorides and vinyl difluorides. We demonstrate that vinyl fluorides within alpha,beta-unsaturated, styrenyl and even enol ether systems can participate in the cycloaddition reaction. The vinyl fluorides are relatively easy to synthesize through a variety of methods, making the 3-fluoropyrrolidines very accessible.