| Entry | R1 | R2 | Yields (%)b | Mp (℃) | |
| Found | Reported (lit.) | ||||
| 4a | C6H5 | C6H5 | 87 | 240-241 | 238-240 [13] |
| 4b | 2-Cl-C6H4 | C6H5 | 95 | 283-284 | 284-285 [14] |
| 4c | 2, 4-(Cl)2-C6H3 | C6H5 | 96 | 262-264 | 262-263 [14] |
| 4d | 2-Br-C6H4 | C6H5 | 92 | 228-229 | 228-230 [15] |
| 4e | 3-NO2-C6H4 | C6H5 | 89 | 241-243 | 240-242 [16] |
| 4f | 3, 4-(Me)2-C6H3 | C6H5 | 94 | 248-249 |
|
| 4g | 3-MeO-C6H4 | C6H5 | 91 | 214-215 | 214-216 [17] |
| 4h | 3- Me-C6H3 | C6H5 | 86 | 235-237 |
|
| 4i | 2-Cl-C6H4 | CH3 | 99 | 205-207 | 206-208 [14] |
| 4j | 2, 4-(Cl)2-C6H3 | CH3 | 99 | 203-204 | 201-203 [18] |
| 4k | 3-Br-C6H4 | CH3 | 86 | 250-251 | 250-252 [19] |
| 4l | 3-F-C6H4 | CH3 | 96 | 247-249 | 248-249 [20] |
| 4m | 4-NO2-C6H4 | CH3 | 99 | 223-224 | 222-223 [17] |
| 4n | C6H5 | CH2=CH | 98 | 255-257 | 255-256 [23] |
| 4o | 4-NO2-C6H4 | CH2=CH | 95 | 222-223 | 223-225 [21] |
| 4p | 4-Me-C6H4 | CH2=CH | 99 | 215-216 | 214-216 [21] |
| 4q | 4-MeO-C6H4 | CH2=CH | 99 | 219-220 | 220-222 [19] |
| 4r | 3-NO2-C6H4 | NH2 | 90 | 190-192 | 191-193 [16] |
| 4s | 4-NO2-C6H4 | NH2 | 99 | 184-186 | 186-188 [22] |