Diisopropylamine → HCID 66742460, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of diisopropylamine (5.68 ml, 0.040 mol) in 100 ml THF at −78° C. was added nBuli (1.6M solution in hexane, 25.9 ml, 0.041 mol) drop-wise. The reaction mixture was warmed to −5° C. and stirring was continued for 30 mins. A solution of 1-benzylpiperidine-4-carboxylic acid ethyl ester (5.00 g, 0.020 mol) in THF (20 ml) was added drop wise and stirring was continued for a further 3 hr followed by the addition of a solution of 1-bromo-2-methoxy-ethane (3.82 g, 0.040 mol) in THF (20 ml) at −5° C. The reaction mixture was then allowed to warm to room temperature and stirring was continued overnight. The reaction mixture was quenched with water and concentrated in vacuo to give a brown residue which was diluted with ethyl acetate and extracted 1N HCl. The aqueous layers were then combined, made basic (with 1N NaOH) and extracted with ethyl acetate. The organic layers were combined, washed with brine, dried (Na2SO4), filtered and concentrated in vacuo to give a crude residue which was purified by flash column chromatography (1:1 AcOEt/heptane) to give 1-benzyl-4-(2-methoxyethyl)-piperidine-4-carboxylic acid ethyl ester (5.2 g, 84%) as a brown oil. MS (ESI): 306.3 (MH+).

Provenance & Evidence