Ethyl 2-(1-(3-bromophenyl)-3-oxobutan-2-ylamino)-2-oxoacetate → Ethyl 4-(3-bromobenzyl)-5-methyloxazole-2-carboxylate

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Reaction Steps

The solution of ethyl 2-(1-(3-bromophenyl)-3-oxobutan-2-ylamino)-2-oxoacetate (1.0 g, 2.9 mmol) in POCl3 (10 mL) was refluxed overnight. The mixture was concentrated, treated with H2O (40 mL), neutralized with aqueous NaHCO3 and extracted with EtOAc (3×20 mL). The combined organic layers were washed with H2O (20 mL), dried over Na2SO4, filtered, and concentrated to afford the crude product, which was purified by silica gel column chromatography (EtOAc:Petroleum ether=1:5) to afford ethyl 4-(3-bromobenzyl)-5-methyloxazole-2-carboxylate as a yellow oil (0.5 g, 51%). MS (ES+) C14H14BrNO3 requires: 323, 325 found: 324 [M+H]+, 326 [M+2+H]+(1:1).

Provenance & Evidence