N-(3-Cyanophenyl)-N'-(1-benzylpiperidin-4-yl)cycloheptylurea → N-(3-Cyanophenyl)-N'-(piperidin-4-yl)cycloheptylurea

Participants

Reaction Steps

N-(3-Cyanophenyl)-N'-(1-benzylpiperidin-4-yl)cycloheptylurea (0.1 g 0.26 mmol) was dissolved in ethanol (10 ml) and cyclohexene (2 ml). Palladium hydroxide catalyst (0.05 g) was added and the reaction was heated at reflux under a nitrogen atmosphere. After 30 min the reaction was allowed to cool to ambient temperature, filtered and concentrated to give a viscous oil. The crude product was purified by flash chromatography on silica gel by eluting with methylene chloride:methanol 85:15 with 3% triethylamine. The product, N-(3-cyanophenyl)-N'-(piperidin-4-yl)cycloheptylurea, was concentrated to give an oil which crystallized from ethyl ether (0.05 g, 48%, mp 157-8° C.); LRMS (M+H)+ m/z 299; 1H NMR (CDCl3): 7.5-7.3(m, 4H), 4.05(m, 1H), 3.60(m, 2H), 3.32(m, 2H), 3.17(m, 2H), 2.72(m, 2H), 2.0-1.6(m, 8H).

Provenance & Evidence