Diisopropylcarbodiimide → [(5S)-3-(5-{2-fluoro-4-[(5R)-2-oxo-5-(1H-1,2,3-triazol-1-ylmethyl)-1,3-oxazolidin-3-yl]phenyl}pyridin-2-yl)-4,5-dihydroisoxazol-5-yl]methyl nicotinate 1-oxide

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(5R)-3-(3-fluoro-4-{6-[(5S)-5-(hydroxymethyl)-4,5-dihydroisoxazol-3-yl]pyridin-3-yl}phenyl)-5-(1H-1,2,3-triazol-1-ylmethyl)-1,3-oxazolidin-2-one (Example 1: 130 mg, 0.30 mMol), nicotinic acid 1-oxide (100 mg, 0.72 mMol), 1,3-diisopropylcarbodiimide (290 mg, 2.3 mMol), and 4-dimethylaminopyridine (5 mg, 0.04 mMol) were suspended in 2 ml of DMF at room temperature. The mixture was stirred one day, diluted with methanol (2 ml), stirred 5 minutes and then further diluted with diethyl ether (20 ml) to give a suspension. The solids were collected and rinsed with diethyl ether, then suspended in acetonitrile:methanol (1:1, 150 ml), the mixture was warmed and stirred a few minutes, then allowed to cool. The suspension was filtered and the filtrate was concentrated to a volume of 10 ml to give a suspension. The solids were collected, rinsed with acetonitrile, then diethyl ether and dried under vacuum to yield the title compound as an off-white solid (90 mg), melting point: 255° C.

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