Compound | [α]D25 in MeOH | mp., ˚C | Yield, % |
4a | ?48.6, c 1.30 | 189 - 191 | 66 |
4b | ?76.5, c 1.37 | 165 - 168 | 58 |
4c | ?84.2, c 1.15 | 122 - 125 | 50 |
4d | ?95.7, c 1.10 | 184 - 186 | 65 |
4e | ?122.8, c 1.20 | 162 - 164 | 60 |
4f | ?80.1, c 1.00 | 132 - 134 | 54 |
4g | +13.7, c 1.00 | 120 - 123 | 55 |
4h | +22.4, c 1.00 | 202 - 204 | 58 |
4i | +28.7, c 1.10 | 148 - 151 | 65 |