Table 1.
substituent | ref | substituent | ref | substituent | ref | substituent | ref |
---|---|---|---|---|---|---|---|
2-Cl | 213 | 3-Me | 213, 214, 221 | 4-CO2Me | 216 | 2,3-di-Me | 221 |
2-Br | 213 | 3-Et | 213 | 4-CH=C(CN)2 | 216 | 2,4-di-Me | 221 |
2-I | 158, 213 | 3-CH=CHCO2Et | 214 | 4-C(Ph)=C(CN)2 | 216 | 2,5-di-Me | 213, 221 |
2-Me | 158, 213 | 4-F | 213, 214 | 4-tert-Bu | 166 | 2,6-di-Me | 213, 222a |
2-Et | 213 | 4-Cl | 158, 213, 214 | 2,4-di-Cl | 217a | 3,4-di-Me | 74, 214, 221 |
2-Ph | 158 | 4-Br | 160, 213, 214 | 2,5-di-Cl | 218a | 3,5-di-Me | 213, 214, 222 |
3-F | 214 | 4-I | 158, 213, 214 | 3,4-di-Cl | 219a | 2,4,5-tri-Me | 163 |
3-Cl | 213, 214 | 4-NO2 | 216 | 3,5-di-Cl | 220 | 2,4,6-tri-Me | 159, 213, 223 |
3-Br | 213, 214 | 4-CN | 216 | 2,4,6-tri-Cl | 158, 159 | ||
3-I | 158, 213, 214 | 4-Me | 158, 213–215a | 3,5-di-Cl-4-I | 158 |
Oxidation using acidified dichromate.