Methylamine → (5R)-N-Methyl-3-(2,2-difluoro-4-methyl-3,4-dihydro-3-oxo-2H-1,4-benzoxazin-7-yl)-2-oxo-5-oxazolidinecarboxamide

Participants

Reaction Steps

To a stirred solution of (5R)-3-(2,2-Difluoro-4-methyl-3-oxo-3,4-dihydro-2H-1,4-benzoxazin-7-yl)-2-oxo-5-oxazolidinecarboxylic acid methyl ester (EXAMPLE 80, Step 3, 50 mg, 0.14 mmol) in MeOH (1 mL) is added 2M MeNH2 in MeOH (2 mL, 4 mmol). The resulting mixture is stirred for 16 h at which time a precipitate forms. The mixture is heated until it becomes clear, and the product is allowed to crystallize at room temperature in the form of white needles. The crystals are separated, washed with ether and dried under high vacuum at 50° C. to give the title compound (25 mg, 50%), 1H NMR (300 MHz, DMSO) δ 8.38 (br d, 1H), 7.60 (d, 1H), 7.51–7.41 (m, 2H), 5.06 (dd, 1H), 4.29 (t, 1H), 4.03 (dd, 1H), 3.41 (s, 3H), 2.65 (d, 2H); MS for C14H13F2N3O5 m/z 342.5 (M+H)+.

Provenance & Evidence