Methyl Ethyl Ketone → (R)-1-(4-(10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-yl)-benzyl)-3-piperidinecarboxylic acid ethyl ester

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of the above iodide (1.80 g, 0.0044 mol), (R)-3-piperidinecarboxylic acid ethyl ester (0.69 g, 0.0044 mol) and anhydrous potassium carbonate (1.82 g, 0.0132 mol) in 2-butanone (30 ml) was heated to 50° C. for 6 h. After cooling, the mixture was diluted with ether (50 ml) and water (50 ml) and the phases were separated. The organic phase was washed with water (30 ml) and dried (MgSO4). The solvent was evaporated in vacuo and the oily residue (2.1 g) was purified by gradient column chromatography on silica gel (40 g) using benzene and ethyl acetate as eluents. The benzene/ethyl acetate (9:1) fraction afforded 1.50 g (77%) of (R)-1-(4-(10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-yl)-benzyl)-3-piperidinecarboxylic acid ethyl ester.

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