反应详情

To a solution of N-(4-methoxybenzyl)-2-(methoxymethyl)-3-oxo-N-(thiazol-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine-7-sulfonamide (500 mg, 1.05 mmol) in THF (10 mL) was added BH3.DMS (0.15 mL, 1.57 mmol, Aldrich) at 0° C. The reaction mixture was stirred at ambient temperature for 16 h. After completion, the reaction mixture was quenched with methanol (7 mL) and was azeotroped with methanol (3×15 mL). The solvent was removed under reduced pressure and the crude material thus obtained was purified by column chromatography (silica: 100-200; elution: 30% ethyl acetate in hexane) to get pure N-(4-methoxybenzyl)-2-(methoxymethyl)-N-(thiazol-2-yl)-3,4-dihydro-2H-benzo[b][1,4]oxazine-7-sulfonamide (350 mg, 71.6%) as a brown solid. m/z (ESI) 462.2 (M+H)+.

1. customat 0° C
2. customAfter completion, the reaction mixture was quenched with methanol (7 mL)
3. customwas azeotroped with methanol (3×15 mL)
4. customThe solvent was removed under reduced pressure
5. customthe crude material thus obtained
6. customwas purified by column chromatography (silica: 100-200; elution: 30% ethyl acetate in hexane)