Use of 1,3-dipolar reactions for the preparation of SF5-substituted five-membered ring heterocycles. Pyrroles and thiophenes
作者:William R. Dolbier、Zhaoyun Zheng
DOI:10.1016/j.jfluchem.2011.03.017
日期:2011.6
4-pentafluorosulfanylthiophenes, the latter of which are to our knowledge the first reported SF5-substituted thiophenes. The 1,3-cycloadditions of these ylides with aryl and alkyl, SF5-alkynes produce dihydro-pyrroles and thiophenes, which without isolation can then be oxidatively aromatized to the respective pentafluorosulfanylpyrroles and thiophenes in good yield.
原位生成的未取代的“母体”偶氮甲碱和硫代羰基乙炔用于制备各种3-芳基和烷基取代的4-五氟硫磺基吡咯和3-芳基取代的4-五氟硫代噻吩基,其中后者我们的知识是第一个报告的SF 5取代噻吩。这些烷基化物与芳基和烷基,SF 5-炔烃进行的1,3-环加成反应生成二氢吡咯和噻吩,然后可以不分离地将其氧化芳香化为相应的五氟磺酰基吡咯和噻吩。