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The hydroamination of alkenes with sulfonamides catalyzed by the recyclable silica gel supported triflic acid |
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| Authors: | Pei Nian Liu Fei XiaZheng Le Zhao Qing Wei WangYu Jie Ren |
| Institution: | a Shanghai Key Laboratory of Functional Materials Chemistry and Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China b State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China c School of Chemistry and Environmental Engineering, Shanghai Institute of Technology, 120 Caobao Road, Shanghai 200235, China |
| Abstract: | 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. |
| Keywords: | Hydroamination Triflic acid Supported catalyst Alkene Sulfonamide |
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