Dicyclohexylcarbodiimide → 3-(4-(4-((2S,4R)-1-Acetyl-4-hydroxy-2-pyrrolidinylcarbonyl)-piperazin-1-yl)-3-fluorophenyl)-5(R)-(isoxazol-3-yloxymethyl)oxazolidin-2-one

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Reaction Steps

A suspension of (2S,4R)-1-acetyl-4-hydroxy-2-pyrrolidinecarboxylic acid (173 mg, 1 mmol) in dichloromethane (10 ml) and DMF (2 ml) under nitrogen was treated successively with dicyclohexylcarbodiimide (227 mg, 1.1 mmol) and 1-hydroxybenzotriazole (149 mg, 1.1 mmol), then stirred at ambient temperature for 1 hour. A solution of 3-(4-(piperazin-1-yl)-3-fluorophenyl)-5(R)-(isoxazol-3-yloxymethyl)oxazolidin-2-one dihydrochloride (435 mg, 1 mmol) and N,N-diisopropylethylamine (258 mg, 2 mmol) in dichloromethane (5 ml) was added, and the mixture stirred for 18 hours. Solid was filtered off, the organic solution evaporated to dryness, and the residue purified by chromatography on a 10 g silica Mega Bond Elut® column, eluting with a gradient increasing in polarity from 0 to 15% MeOH in dichloromethane. Relevant fractions were combined and evaporated to give the desired product after trituration with diethyl ether (210 mg).

Provenance & Evidence