| Entry | R1 | R2 | R3 | Yields (%)b | Mp (℃) | |
| Found | Reported | |||||
| 3a | H | Ph | Ph | 95 | 127-128 | 127-128 [21] |
| 3b | H | Ph | 4-F- C6H4 | 99 | 140-142 | 142-143 [22] |
| 3c | H | Ph | 4-Cl-C6H4 | 92 | 116-118 | 118-120 [23] |
| 3d | H | Ph | 4-OCH3-C6H4 | 94 | 120-122 | 124-125 [24] |
| 3e | H | 4-Cl-C6H4 | Ph | 94 | 155-156 | 154-155 [25] |
| 3f | H | 4-Br-C6H4 | Ph | 99 | 173-175 | 174-176 [26] |
| 3g | H | 4-OCH3-C6H4 | Ph | 93 | 180-181 | 182-183 [25] |
| 3h | H | 4-OCH3-C6H4 | 4-F- C6H4 | 92 | 170-172 |
|
| 3i | H | 4-OCH3-C6H4 | 4-CH3- C6H4 | 92 | 184-185 | 183-186 [27] |
| 3j | H | 4-OEt-C6H4 | 3,4-(CH3)2-C6H3 | 86 | 146-148 |
|
| 3k | H | 4-OEt-C6H4 | 3-F-4-Br-C6H3 | 91 | 114-116 |
|
| 3l | H | 4-OEt-C6H4 | 2-Cl-4-F-C6H3 | 89 | 157-159 |
|
| 3m | H | 3,4-(Cl)2-C6H3 | 3,4-(CH3)2-C6H3 | 88 | 105-107 |
|
| 3n | CH3 | Ph | Ph | 98 | 125-126 | 127-129 [28] |
| 3o | CH3 | Ph | 4-F- C6H4 | 84 | 161-163 |
|
| 3p | CH3 | Ph | 4-Cl- C6H4 | 99 | 151-155 | 153-154 [29] |
| 3q | CH3 | Ph | 4-Br- C6H4 | 92 | 102-104 |
|
| 3r | CH3 | Ph | 4-OCH3- C6H4 | 93 | 134-136 | 130-131 [30] |
| 3s | CH3 | 4-Cl-C6H4 | Ph | 85 | 135-136 | 142-143 [24] |
| 3t | CH3 | 4-Br-C6H4 | Ph | 96 | 138-140 |
|
| 3u | CH3 | 4-Cl-C6H4 | 4-OCH3- C6H4 | 82 | 160-162 |
|
| 3v | CH3 | 4-Br-C6H4 | 3,4-(CH3)2-C6H3 | 99 | 169-171 |
|
| 3w | CH3 | 4-OEt-C6H4 | 2-Cl-4-F-C6H3 | 99 | 144-145 |
|
| 3x | CH3 | 4-OEt-C6H4 | 3,4-(CH3)2-C6H3 | 97 | 135-137 |
|
| 3y | CH3 | 2,4-(CH3)2-C6H3 | 3,4-(Cl)2-C6H3 | 94 | 153-154 |
|
| 3z | CH3 | 3,4-(Cl)2-C6H3 | 3,4-(CH3)2-C6H3 | 86 | 127-128 |
|