1 引言
2 结果与讨论
2.1 条件优化
表1 条件优化Table 1 Conditions optimizationa |
| Entry | Variation from the standard conditions | Yieldb/% |
|---|---|---|
| 1 | none | 85 |
| 2 | nBu4NBF4 instead of nBu4NOAc | 65 |
| 3 | nBu4NPF6 instead of nBu4NOAc | 25 |
| 4 | TEBAC instead of nBu4NOAc | 55 |
| 5 | nBu4NClO4 instead of nBu4NOAc | n.r. |
| 6 | nBu4NI instead of nBu4NOAc | trace |
| 7 | nBu4NBr instead of nBu4NOAc | trace |
| 8 | nBu4NCl instead of nBu4NOAc | trace |
| 9 | 18-Crown-6 instead of nBu4NOAc | n.r. |
| 10 | KOAc instead of nBu4NOAc | 31 |
| 11 | K2CO3 instead of nBu4NOAc | n.r. |
| 12 | Na2CO3 instead of nBu4NOAc | n.r. |
| 13 | No PTC | n.r. |
| 14 | 40 ℃ | 83 |
| 15 | N2 | 85 |
| 16 | Neat | n.r. |
a Reaction conditions: compound 1a (0.2 mmol), compound 2a (0.4 mmol), nBu4NOAc (0.04 mmol), H2O 2 mL, 2 h, room temperature, air condition, b Isolated yield. n.r.=no reaction. |
