Potassium Carbonate → HCID 53651881, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of the above alcohol (2.1 g, 7.4 mmol), triethylamine (2.6 ml) and toluene (30 ml) placed under an atmosphere of nitrogen was cooled on an ice-bath. A solution of methanesulfonyl chloride (2.1 g, 15 mmol) in toluene (5 ml) was added dropwise. Stirring was continued for 45 minutes on an ice-bath and then the temperature was allowed to reach ambient temperature. Water (20 ml) was added and the mixture was stirred at room temperature for 15 minutes. The phases were separated and the organic phases were washed with a 5% aqueous sodium bicarbonate solution and brine and dried over magnesium sulphate. The solvent was evaporated in vacuo to give an oil which was dissolved in methyl isobutylketone (40 ml). To this solution was added potassium carbonate (3.6 g, 26 mmol) and ethyl (R)-3-piperidinecarboxylate tartrate (4.6 g, 15 mmol). The suspension was heated at 40° C. for 24 h and then at reflux temperature for 3 h. The reaction mixture was allowed to cool to ambient temperature and water (50 ml) was added. The phases were separated and from the organic phase the solvent was evaporated in vacuo. This afforded an oily residue which was submitted to column chromatography on silica gel (125 g) using a mixture of ethyl acetate and n-heptane (1:1) as eluent. Collecting the proper fractions afforded 1.0 g of (R)-N-(2-(2-(6,11-dihydro-5H-dibenz[b,e]azepin-5-yl)ethoxy)ethyl)-3-piperidinecarboxylic acid ethyl ester as an oil. TLC: rf=0.36 (SiO2 ; ethyl acetate).

Provenance & Evidence