1 引言
2 结果与讨论
2.1 反应条件优化
表1 反应条件的优化aTable 1 Optimization of the reaction conditionsa |
| Entry | Base | Solvent | Yieldb/% |
|---|---|---|---|
| 1 | Cs2CO3 | PhCF3 | 34 |
| 2 | NaOH | PhCF3 | 22 |
| 3 | K3PO4 | PhCF3 | 38 |
| 4 | LiOtBu | PhCF3 | 22 |
| 5 | Li2CO3 | PhCF3 | 66 |
| 6 | LiOAc | PhCF3 | 59 |
| 7 | NaOAc | PhCF3 | 73 |
| 8 | NaOAc | DMSO | n.d. |
| 9 | NaOAc | MeCN | 12 |
| 10 | NaOAc | 1,4-Dioxane | 11 |
| 11 | NaOAc | Toluene | 80 |
| 12 | NaOAc | DCE | 90 (83) |
| 13c | NaOAc | DCE | 74 |
| 14d | NaOAc | DCE | 89 |
| 15e | NaOAc | DCE | 95 (88) |
a Reaction conditions: sulfenamide 1a (0.2 mmol), base (0.4 mmol), mesityl(trifluoroethyl)iodonium triflate 2a (0.3 mmol), solvent (2 mL), 25 ℃, air, 24 h. b Determined by 1H NMR analysis using 1,3,5-trimethoxybenzene as an internal standard (isolated yield in parentheses), n.d.=not detected. c 40 ℃. d Under N2 atomosphere. e Mesityl(trifluoroethyl)iodonium triflate 2a (0.4 mmol). |
2.2 反应底物普适性考察
表2 次磺酰胺的底物范围a,bTable 2 Substrate scope of sulfenamidesa,b |
| |
a Reaction conditions: sulfenamide 1 (0.2 mmol), NaOAc (0.4 mmol), mesityl(trifluoroethyl)iodonium triflate 2a (0.4 mmol), DCE (2 mL), 25 ℃, air, 24 h. b Isolated yield based on sulfenamide 1. c Li2CO3 (0.6 mmol). d mesityl(trifluoroethyl)iodonium triflate 2a (0.6 mmol). e Li2CO3 (0.4 mmol). |


