Table 1.
R | R′ | Yield | |
---|---|---|---|
2a | t-Bu | 4-OMe | 93% |
2b | t-Bu | 4-NO2 | 93% |
2c | t-Bu | H | 92% |
2d | t-Bu | 2,3,4,5,6-pentafluoro | 81% |
3a | CO2Et | 4-OMe | 57% |
3b | CO2Et | 4-NO2 | 30% |
3c | CO2Et | H | 26% |
3d | CO2Et | 2,3,4,5,6-pentafluoro | 76% |
4a | CF3 | 4-OMe | 16% |
4b | CF3 | 4-NO2 | 34% |
4c | CF3 | H | 37% |
4d | CF3 | 2,3,4,5,6-pentafluoro | 75% |
5a | OMe | 4-OMe | 64% |
5b | OMe | 4-NO2 | 86% |
5c | OMe | H | 61% |
5d | OMe | 2,3,4,5,6-pentafluoro | 71% |