O-Toluidine → Tert-butyl 4-(4-(2-(o-toluidino)-4-(ethoxycarbonyl)oxazol-5-yl)phenyl)piperazine-1-carboxylate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of tert-butyl 4-(4-(4-(ethoxycarbonyl)-2-iodooxazol-5-yl)phenyl)piperazine-1-carboxylate (0.06 g, 0.11 mmol), o-toluidine (0.061 ml, 0.57 mmol), tris(dibenzylideneacetone)dipalladium(0) (0.005 g, 0.005 mmol), 2-(dicyclohexylphosphino)-2′,4′,6′-tri-1-propyl-1,1′-biphenyl (0.011 g, 0.02 mmol) and potassium carbonate (0.063 g, 0.46 mmol) in DMF (1.5 ml) was degassed and heated in the microwave at 150° C. for 20 minutes. The reaction mixture was diluted with EtOAc and washed with water (×2). The organic phase was passed through a MP-SH cartridge, dried over MgSO4 and the solvent removed in vacuo. The residue was purified by silica gel column chromatography using 10-90% EtOAc in hexane as gradient to afford tert-butyl 4-(4-(2-(o-toluidino)-4-(ethoxycarbonyl)oxazol-5-yl)phenyl)piperazine-1-carboxylate (0.030 g, 0.06 mmol, 52%). LCMS (1) Rt: 2.63 min; m/z (ES+) 507.

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