反应详情

To a 100 mL round bottomed flask with a stirring bar and an argon inlet was added 4-(4-(1,1-dimethylethoxycarbonyl) piperazinyl)benzoic acid (0.75 g, 2.45 mmol), ethyl 4-amino-3-methylphenoxyacetate hydrochloride (0.60 g, 2.45 mmol), chloro-N,N,N',N',-bis(pentamethylene)formamidinium hexafluorophosphate (0.97 g, 2.69 mmol), and CH2Cl2 (30 mL). This mixture was cooled in an ice bath and diisopropylethylamine (1.74 mL, 10.0 mmol) was added. The ice bath was allowed to expire and the solution was stirred at ambient temperature for 48 h. The solution was diluted with CHCl3 and washed with 10% aqueous citric acid, saturated aqueous NaHCO3, and brine. Drying (MgSO4), filtration and removal of the solvent in vacuo gave an oil. This material was chromatographed on 75 g of silica gel using 50% EtOAc-hexane as eluant. There was obtained 1.22 g (100%) of ethyl 2-(4-(4-(4-(1,1-dimethylethoxycarbonyl)piperazin-1-yl)phenylcarbonylamino)-3-methylphenoxy)acetate as a crystalline solid.

1. temperatureThis mixture was cooled in an ice bath
2. washwashed with 10% aqueous citric acid, saturated aqueous NaHCO3, and brine
3. customDrying
4. filtration(MgSO4), filtration and removal of the solvent in vacuo
5. customgave an oil
6. customThis material was chromatographed on 75 g of silica gel using 50% EtOAc-hexane as eluant