反应详情

6-Hydroxy-1H-benzo[d][1,3]oxazine-2,4-dione (9.7 g, 54 mmol), tert-butyldiphenylchlorosilane (15.2 mL, 59 mmol) and imidazole (4 g, 59 mmol) were stirred in DMF (100 mL) for 24 h at rt. The reaction mixture was extracted with ethyl acetate (400 mL) and water 300 mL). The product in the organic layer was purified by chromatography on silica gel in hexane/ethyl acetate 2:1 and then crystallized from hot ethyl acetate/hexane, affording white crystals (13 g, 58%), mp. 185° C.

1. extractionThe reaction mixture was extracted with ethyl acetate (400 mL) and water 300 mL)
2. customThe product in the organic layer was purified by chromatography on silica gel in hexane/ethyl acetate 2:1
3. customcrystallized from hot ethyl acetate/hexane