Table 1 Comparative data of conventional (A) and MW (B) methods for the synthesis of compounds 6a–d, 13a, b, 18a–c, 21a, b and 23a, b
Compound no. | Conventional method (A) | Microwave method (B) | ||
|---|---|---|---|---|
Time (h) | Yield (%) | Time (min) | Yield (%) | |
6a | 12 | 66 | 4 | 84 |
6b | 15 | 68 | 10 | 85 |
6c | 10 | 70 | 8 | 88 |
6d | 8 | 69 | 5 | 90 |
13a | 12 | 67 | 6 | 82 |
13b | 10 | 70 | 6 | 89 |
18a | 8 | 66 | 7 | 90 |
18b | 6 | 68 | 10 | 88 |
18c | 4 | 67 | 7 | 90 |
21a | 6 | 69 | 8 | 86 |
21b | 5 | 64 | 6 | 92 |
23a | 8 | 72 | 10 | 81 |
23b | 8 | 67 | 9 | 83 |