Entry | R1 | R2 | X | Product | Yield (%)a | M.P. (°C) | Refs. |
---|---|---|---|---|---|---|---|
1 | ph | ph | Br | 3a | 90 | 131–133 | [47] |
2 | ph | 4-NO2-ph | Br | 3b | 91 | 140–141 | [48] |
3 | 4-OMe-ph | ph | Br | 3c | 86 | 142–143 | [49] |
4 | 4-OMe-ph | 4-Me-ph | Br | 3d | 92 | 149–151 | [50] |
5 | ph | 4-Me-ph | Br | 3e | 89 | 106–107 | [51] |
6 | ph | 4-Br-ph | Br | 3f | 93 | 150–152 | [48] |
7 | 4-Me-ph | 4-Br-ph | Br | 3g | 92 | 202–203 | [48] |
8 | 4-OMe-ph | 4-NO2-ph | Br | 3h | 97 | 167–168 | [47] |
9 | 4-CF3-ph | 4-NO2-ph | Br | 3i | 88 | 215–217 | [52] |
10 | 4-Me-ph | ph | Br | 3j | 90 | 153–154 | [53] |
11 | 4-Me-ph | 4-NO2-ph | Br | 3k | 86 | 159–160 | [54] |
12 | ph | 4-OMe-ph | Cl | 3l | 88 | 136–138 | [49] |
13 | 4-Me-ph | 4-OMe-ph | Cl | 3m | 89 | 133–136 | [51] |
14 | 4-OMe-ph | ph | Cl | 3c | 88 | 142–143 | [49] |
15 | ph | n-C3H7 | Br | 3n | 64 | 41–42 | [55] |
16 | ph | n-C4H9 | Br | 3o | 65 | 42 | [56] |
17 | CO2Me | ph | Br | 3p | 63 | 104–105 | [57] |
18 | CO2Me | 4-NO2-ph | Br | 3q | 61 | 189–190 | [57] |