Cesium carbonate → Ethyl 4-methyl-5-(3-(4-methylpiperazin-1-yl)benzyl)thiazole-2-carboxylate

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A mixture of ethyl 5-(3-bromobenzyl)-4-methylthiazole-2-carboxylate (340 mg, 1.0 mmol), 1-methylpiperazine (0.2 mL, 2 mmol) and Cs2CO3 (652 mg, 2 mmol) in toluene (5 mL) was degassed (argon bubbling for 5 min), tris(dibenzylideneacetone)dipalladium(0) (46 mg, 0.05 mmol) and 2-dicyclohexylphosphino-2′,4′,6′-triisopropylbiphenyl (48 mg, 0.1 mmol) were quickly added. The reaction mixture was refluxed overnight, cooled to RT, then quenched with H2O and extracted with EtOAc (3×30 mL). The organic layers were washed with H2O (30 mL) and brine (10 mL), dried over Na2SO4, filtered, and concentrated to afford the crude product, which was purified by silica gel column chromatography (DCM:MeOH=20:1) to give ethyl 4-methyl-5-(3-(4-methylpiperazin-1-yl)benzyl)thiazole-2-carboxylate as a yellow solid (270 mg, 75%). MS (ES+) C19H25N3O2S requires: 359, found: 360[M+H]+.

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