Trifluoroacetic acid → HCID 67403905, compound

Participants

Reaction Steps

tert-butyl 4-((1-(5-chloro-1H-indazol-7-yl)-2-methoxy-2-oxoethoxy)methyl)-4-(4-fluorophenyl)piperidine-1-carboxylate (20 mg) was dissolved in trifluoroacetic acid (20% in dichloromethane, 1.5 mL) and stirred for 20 min at room temperature. The reaction was concentrated and the resulting residues loaded onto a strong cation exchange cartridge. The cartridge was flushed with several volumes of methanol which were discarded. The amine was eluted with 2M ammonia in methanol and concentrated. The unprotected piperidine was dissolved in acetonitrile (1 mL) and treated with formalin (50 μL) and sodium cyanoborohydride (2.4 mg) and one drop of acetic acid. The reaction was stirred at room temperature for 1 h. The reaction was concentrated. The resulting residue was dissolved in trifluoroacetic acid (25% in dichloromethane, 2 mL), stirred for 5 min, and concentrated. The resulting residue was purified by preparative HPLC to afford the title compound. 1H-NMR (CD3OD, 500 MHz) δ 8.05 (m, 1H), 7.78 (m, 1H), 7.44 (m, 2H), 7.22 (m, 0.75H), 7.13 (m, 1.8H), 7.03 (m, 0.6H), 5.34 (s, 0.3H), 5.27 (s, 0.7H), 3.69 (m, 4H), 3.47 (m, 4H), 2.55-3.00 (m, 7H), 2.00-2.55 (m, 2.5H). Mass spec.: 446.24 (MH)+.

Provenance & Evidence