反应详情

6-(Trifluoromethoxy)-3,4-dihydro-2H-1,4-benzoxazine-2-carboxylic acid (490 mg, 1.86 mmol) and (5-amino-4-bromo-2-cyclopentyl-phenyl) methyl carbonate (585 mg, 1.86 mmol) were dissolved in 2-methyltetrahydrofuran (13 mL). Pyridine (376 μL, 4.65 mmol) and T3P (2960 mg, 2.8 mL of 50% w/w solution, 4.66 mmol) were added and the reaction was stirred for 1 h at room temperature. Purification by silica gel chromatography (10-75% ethyl acetate/hexanes) yielded 4-bromo-2-cyclopentyl-5-(6-(trifluoromethoxy)-3,4-dihydro-2H-benzo[b][1,4]oxazine-2-carboxamido)phenyl methyl carbonate (802 mg, 77% yield). LC/MS m/z 560.2 [M+H]+.

1. customPurification by silica gel chromatography (10-75% ethyl acetate/hexanes)