1,1'-Carbonyldiimidazole → HCID 57619816, compound

Participants

Reaction Steps

A solution of tert-butyl 4-[4-[[(1R,2R)-2-aminocyclohexyl]amino]-1-piperidyl]-4-methyl-piperidine-1-carboxylate in acetonitrile (20 mL) was added with 1,1′-carbonyldiimidazole (1.30 g, 8.0 mmol) and the reaction mixture was stirred at room temperature for 12 h. The solvent was removed in vacuo and the residue was taken up in water (20 mL) and dichloromethane (80 mL). The phases were separated and the aqueous phase was extracted with dichloromethane (2×50 mL). The combined organic phases were washed with brine, dried over Na2SO4, filtered, and concentrated in vacuo to give the crude product, which was purified with preparative LC/MS (high pH) to give the title compound as white solid (849 mg, 30% over two steps). 1H NMR (400 MHz, METHANOL-D4) δ ppm 0.95 (s, 3H), 1.31-1.40 (m, 4H), 1.42 (s, 9H), 1.44-1.48 (m, 2H), 1.52-1.63 (m, 1H), 1.64-1.89 (m, 8H), 1.93-1.99 (m, 1H), 2.08-2.21 (m, 2H), 2.25-2.32 (m, 1H), 2.89-3.10 (m, 4H), 3.28-3.36 (m, 1H), 3.42-3.53 (m, 2H), 3.54-3.65 (m, 1H). MS (M+1): 421.3.

Provenance & Evidence