Preparation of Pentafluorosulfanyl (SF<sub>5</sub>) Pyrrole Carboxylic Acid Esters
作者:William R. Dolbier、Zhaoyun Zheng
DOI:10.1021/jo9007699
日期:2009.8.7
paper, a facile preparation of SF5-substituted pyrrole carboxylic acid esters in good yield is reported. Utilizing the cycloaddition of an azomethine ylide to pentafluorosulfanylalkynes, a series of dihydropyrroles were prepared and oxidized to the respective 1-tert-butyl-4-(pentafluorosulfanyl)pyrrole-2-carboxylic acid esters in good yield. Further treatment of these pyrroles with catalytic triflic
目前尚不知道带有五氟硫烷基的吡咯衍生物。本文报道了一种简便,高收率的SF 5取代吡咯羧酸酯的制备方法。利用偶氮甲meth内酯的环加成反应生成五氟硫烷基炔基,制备了一系列二氢吡咯并氧化成各自的1-叔丁基-4-(五氟硫烷基)吡咯-2-羧酸酯。用催化三氟甲磺酸进一步处理这些吡咯,可以除去叔丁基。