Entry | R | Time (h) | Yield (%)a | m. p. (°C) | Refs. |
---|---|---|---|---|---|
1 | H | 1.15 | 85 | 177–179 | [32] |
2 | 4-NO2 | 1 | 97 | 171–173 | [33] |
3 | 4-Cl | 1 | 95 | 86–88 | [31] |
4 | 4-Br | 0.75 | 97 | 110–114 | [31] |
5 | 4-OH | 1.30 | 84 | 210–212 | [31] |
6 | 2-Cl | 2 | 90 | 122–123 | [6] |
7 | 2-OEt | 2.5 | 89 | 171–173 | [11] |
8 | 2-NO2 | 1.5 | 79 | 122–124 | [31] |
9 | 3-NO2 | 1.20 | 95 | 222–223 | [6] |
10 | 3-OH | 1.5 | 81 | 261–262 | [6] |
11 | 2,4-(Cl)2 | 1 | 87 | 133–134 | [4] |
12 | 2,4-(OMe)2 | 1.40 | 77 | 164–165 | [12] |
13 | 3,4-(OH)2 | 1.40 | 75 | 227–229 | [6] |