Benzotriazol-1-yloxy-tris(dimethylamino)phosphonium hexafluorophosphate → 4-Cyano-4-[(5-methyl-pyridine-3-carbonyl)-amino]-piperidine-1-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-amino-4-cyano-piperidine-1-carboxylic acid tert-butyl ester (0.485 g, 2.15 mmol, 1.0 equiv; prepared as described in WO 03/104 236 A1 (Bristol-Myers Squibb Company); [CAS RN 331281-25-5]) in anhydrous THF (11 mL) and N-ethyl diisopropylamine (0.44 mL) was added in the presence of (benzotriazol-1-yloxy)-tris-(dimethylamino)phosphonium hexafluorophosphate (1.047 g, 2.37 mmol, 1.1 equiv; BOP reagent) 5-methyl-nicotinic acid (0.295 g, 2.15 mmol, 1.0 equiv) and the reaction mixture stirred at 40° C. during a weekend. The reaction mixture was poured on crashed ice/NH4Cl, extracted with ethyl acetate (2×200 mL) and the combined organic phases washed with a sat. solution of NaCl (2×100 mL) and water (2×100 mL). The organic phase was dried over Na2SO4, concentrated by evaporation under reduced pressure and the crude material purified by silica column chromatography eluting with a mixture of ethyl acetate/triethylamine (97:3) providing 0.48 g (65%) of the title compound as off-white foam. MS (ISP): 345.3 [M+H]+

Provenance & Evidence