Table 2.
Entry | 1 | 3 | 4 | Yield (%) |
---|---|---|---|---|
1 | R1 = R2 = H | R3 = Ph | 4a | 93 |
2 | R1 = CH2C6H4, R2 = H | R3 = Ph | 4b | 89 |
3 | R1 = H, R2 = Br | R3 = Ph | 4c | 92 |
4 | R1 = CH2C6H4, R2 = H | R3 = 3,4-Cl2C6H3 | 4d | 83 |
R1 = R2 = H | ||||
5 | R1 = H, R2 = F | R3 = 4-BrC6H4 | 4e | 90 |
6 | R1 = H, R2 = Cl | R3 = Ph | 4f | 91 |
7 | R1 = CH3, R2 = H | R3 = Ph | 4g | 84 |
8 | R1 = R2 = H | R3 = Ph | 4h | 95 |
9 | R1 = H, R2 = Cl | R3 = 3-ClC6H4 | 4i | 88 |
10 | R1 = CH2C6H4, R2 = H | R3 = 3-ClC6H4 | 4j | 93 |
11 | R1 = H R2 = H | R3 = 3-ClC6H4 | 4k | 89 |
R1 = H R2 = H | ||||
12 | R3 = 4-CF3C6H4 | 4l | 85 | |
13 | R3 = 4-OCH3C6H4 | 4m | 82 |