反应详情

To a stirred solution of urethane (0.82 g, 9.21 mmol) and DMAP (0.05 g, 0.41 mmol) in pyridine (10 ml) was added at 0° C. 9H-xanthene-9-carbonyl chloride (1.50 g, 6.13 mmol). Stirring was continued at RT for 17 h, the reaction mixture was evaporated and water (50 ml)/sat. NaHCO3 solution (20 ml) was added. The solid was filtered off and crystallized from water and afterwards from EtOH/hexane to give the product (1.22 g, 67%) as a white solid, m.p. 228° C. (dec.) and MS: m/e=298.2 (M+H+).

1. customthe reaction mixture was evaporated
2. additionNaHCO3 solution (20 ml) was added
3. filtrationThe solid was filtered off
4. customcrystallized from water and afterwards from EtOH/hexane