Trifluoromethanesulfonic acid, lithium salt → methyl (2R)-3-[(4-fluoro-3-methyl-2-oxo-2,3-dihydro-6-benzoxazolyl)amino]-2-hydroxypropanoate

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A mixture of 6-amino-4-fluoro-3-methyl-1,3-benzoxazol-2(3H)-one (Step 7, 0.630 g, 3.46 mmol), methyl (2R)-glycidate (0.353 g, 3.46 mmol) and lithium trifluoromethanesulfonate (0.540 g, 3.46 mmol) in acetonitrile (10 ml) is stirred and heated at 90° C. overnight. The reaction mixture is diluted with ethyl actetate, washed with water and saline, dried (MgSO4), and evaporated under reduced pressure. Final purification by flash column chromatography (50% ethyl acetate/hexane) gives pure product as a white solid (0.98 g, 60%); MS for C12H13FN2O5 m/z 285 (M+H)+.

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