Entry | Product | R | Time (min) | Yield (%, w/w ) |
1 | 4a | H | 25 | 93% |
2 | 4b | 4-OCH3 | 25 | 90% |
3 | 4c | 4-Chloro | 25 | 92% |
4 | 4d | 4-NO2 | 25 | 96% |
5 | 4e | 2-NO2 | 25 | 95% |
6 | 4f | 4-(2-pyridyl) | 25 | 94% |