Potassium Carbonate → HCID 54293927, compound

Participants

Reaction Steps

A solution of 4-phenyl-4-(thiophen-2-yl)piperidine and 3-Boc-aminopropylbromide (1.0 g, 4.4 mmol) with 1 g of K2CO3 in 20 ml of dioxane was stirred at reflux for 12 h. The reaction mixture was diluted with water and extracted with EtOAc. The organic solution was dried over Na2SO4 and concentrated in vacuo to yield an oil which was subjected to column chromatography over silica gel (EtOAc) to provide 0.43 g (1.1 mmol, 20% for two steps) of 3-(4-phenyl-4-(thiophene-2-yl)piperidin-1-yl)-propylcarbamic acid tert-butyl ester as colorless oil. The ester in 5 ml of CH2Cl2 was added with 1 ml of CF3CO2H and resulting solution was stirred for 1 h at 25° C. The reaction mixture was concentrated in vacuo to yield oily mixture, which was dissolved in EtOAc and washed with aqueous NaHCO3. Concentration of the reaction mixture provided the desired product as an oil (0.29 g, 0.96 mmol, 88%) which was used in the next step without further purification.

Provenance & Evidence