反应详情

A mixture of (R)-1-(4-methanesulfonyloxy-pyrimidin-2-yl)-ethyl acetate (prepared according to the method of Preparation Six, 24.1 g, 92 mmol) and piperazine (16.0 g, 184 mmol) in tetrahydrofuran (200 mL) was heated at reflux for 1 h. This mixture was cooled, filtered, concentrated, and purified by flash column chromatography (9:1 dichloromethane/methanol) to give 24.4 g (88%) of the title compound as an oil. 1H NMR (CDCl3, 300 MHz) δ 1.56 (d, 3H), 2.25 (s, 3H), 2.83 (m, 4H), 3.63 (m, 4H), 5.54 (q, 1H), 6.38 (d, 1H), 8.24 (d, 1H); MS (Cl) 251 (MH+).

1. customprepared
2. temperaturewas heated
3. temperatureat reflux for 1 h
4. temperatureThis mixture was cooled
5. filtrationfiltered
6. concentrationconcentrated
7. custompurified by flash column chromatography (9:1 dichloromethane/methanol)