Water → HCID 49801654, compound

Participants

Reaction Steps

1-Benzenesulfonyl-4-(3-methoxy-propyl)-piperidine-4-carboxylic acid ethyl ester (0.3 g) was dissolved under an argon atmosphere in toluene (10 ml), 4-(trifluormethoxy)-aniline (0.173 g) was added followed by dimethylaluminium chloride in heptane (1.8 ml, 0.9 molar). The mixture was refluxed 3 hours, more 4-(trifluormethoxy)-aniline (0.173 g) and dimethylaluminium chloride in heptane (1.8 ml) were added and refluxing was continued for further 3 hours. The reaction mixture was then cooled to RT, water (1 ml) was added and the mixture was stirred for 10 minutes. The solvent was evaporated off, the residue absorbed on silica gel and purified by flash-chromatography (AcOEt/heptane, gradient from 0 to 25%) to give the desired 9-benzenesulfonyl-2-(4-trifluoromethoxy-phenyl)-2,9-diaza-spiro[5.5]undecan-1-one (0.215 g) as a white solid. MS (ESI): 469.13 (MH+)

Provenance & Evidence