Dimethyl dicarbonate → 4-(1-(4-Cyclobutyl-2-methyl-5-(5-methyl-4,5,6,7-tetrahydro-3H-imidazo[4,5-c]pyridin-2-yl)benzoyl)piperidin-4-yl)benzonitrile

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-(1-(4-cyclobutyl-2-methyl-5-(4,5,6,7-tetrahydro-3H-imidazo[4,5-c]pyridin-2-yl)benzoyl)piperidin-4-yl)benzonitrile (406.3, 180 mg, 0.300 mmol, 1.00 equiv, 80%) in N,N-dimethylformamide (5 mL) were added dimethyl dicarbonate (176 mg, 1.31 mmol, 5.00 equiv) and DIEA (169 mg, 1.31 mmol, 5.00 equiv). The resulting solution was stirred overnight at 25° C. and then quenched with 20 mL of methanol. The resulting mixture was concentrated under reduced pressure and the crude product was purified by Prep-HPLC using the following conditions (1#-Pre-HPLC-001(SHIMADZU)): Column, SunFire Prep C18, 19*150 mm 5 um; mobile phase, water with 0.05% TFA and CH3CN (28% CH3CN up to 43% in 8 min, up to 100% in 3 min, down to 28% in 2 min); Detector, Waters 2489 254&220 nm. The fractions containing pure compound were combined and lyophilized to yield 29.9 mg (19%) of the title compound as a white solid. m/z (ES+) 538 (M+H)+. 1H NMR (400 MHz, CD3OD): δ 7.70 (m, 2H), 7.50-7.35 (m, 4H), 4.90 (m, 1H), 4.70 (s, 2H), 4.00 (m, 2H), 3.80 (m, 4H), 3.60 (m, 1H), 3.25 (m, 1H), 3.05 (m, 2H), 2.85 (m, 2H), 2.50 and 2.40 (2 singlets, amide rotamers, ArCH3, 3H), 2.16-2.00 (m, 6H), 1.86-1.64 (m, 4H).

Provenance & Evidence