Journal
TETRAHEDRON LETTERS
Volume 52, Issue 46, Pages 6113-6117Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2011.09.025
Keywords
Hydroamination; Triflic acid; Supported catalyst; Alkene; Sulfonamide
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Funding
- National Natural Science Foundation of China [20902020, 21172069]
- Shanghai Municipal Education Commission [12ZZ050]
- Fundamental Research Funds for the Central Universities
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The vast applications of triflic acid (TfOH) in catalysis are severely limited by its corrosive and fuming properties. Immobilization of TfOH on silica gel well solves these problems and affords efficient recovery and reusability of TfOH. Two types of supported TfOH, the prepared silica gel supported TfOH and the in situ silica gel adsorbed TfOH, both exhibit good catalytic activity and reusability in the hydroamination of alkene with sulfonamide. The in situ silica gel adsorbed catalyst has been used for 5 runs with maintained reactivities and yields, which are superior to the performance of the prepared silica gel supported TfOH. For a series of alkenes and various sulfonamides, the heterogeneous hydroamination reactions catalyzed by both types of silica gel supported TfOH to afford similar moderate to excellent yields. (C) 2011 Elsevier Ltd. All rights reserved.
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