Use of 1,3-dipolar reactions for the preparation of SF5-substituted five-membered ring heterocycles. Pyrroles and thiophenes |
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Authors: | William R Dolbier Jr Zhaoyun Zheng |
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Institution: | Department of Chemistry, University of Florida, Gainesville, FL 32611-7200, United States |
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Abstract: | In situ-generated unsubstituted, “parent” azomethine and thiocarbonyl ylides are used to prepare a large variety of 3-aryl- and alkyl-substituted, 4-pentafluorosulfanylpyrroles and 3-aryl-substituted, 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. |
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Keywords: | Pentafluorosulfanyl group SF5 Pyrrole synthesis Thiophene synthesis 1 3-Dipolar cycloadditions |
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