Potassium tert-butoxide → HCID 51353619, compound

Participants

Reaction Steps

In an oven-dried 100 mL round-bottom flask was dissolved (6S,8R,9S)-6-(2,3-difluorophenyl)-6,7,8,9-tetrahydro-5H-cyclohepta[b]pyridine-8,9-diol (61 mg, 0.209 mmol) (azeotroped with dry benzene) and 1-(1-(1H-imidazole-1-carbonyl)piperidin-4-yl)-1H-imidazo[4,5-b]pyridin-2(3H)-one (65.4 mg, 0.209 mmol) in tetrahydrofuran (2 mL) to give a colorless solution under nitrogen. After cooling to 0° C. (ice bath), potassium t-butoxide (1M in tetrahydrofuran, 0.754 mL, 0.754 mmol) was added dropwise, and the tan suspension was warmed up to room temperature with stirring. After 2 h some SM remained. Another 20 mg of 1-(1-(1H-imidazole-1-carbonyl)piperidin-4-yl)-1H-imidazo[4,5-b]pyridin-2(3H)-one was added, and the mixture was left stirring overnight. After 18 h the reaction was quenched with sodium bicarbonate solution and diluted with ethyl acetate. The layers were separated and the aqueous layer was extracted with ethyl acetate twice. The combined organic layers were washed with brine, dried with sodium sulfate, and concentrated to give a yellow oil. Purification by FCC up to 10% methanol/methylene chloride afforded the desired product (last peak, 16 mg, 14%) as a light yellow foam. MS(ESI)[M+H+]=536.26, 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 8.27-8.59 (m, 1H) 8.08 (dd, J=5.29, 1.26 Hz, 1H) 7.54 (d, J=2.52 Hz, 1H) 7.31-7.51 (m, 1H) 7.22 (dd, J=7.30, 5.04 Hz, 1H) 6.93-7.19 (m, 4H) 5.39-5.63 (m, 1H) 5.18 (br. s., 1H) 4.45-4.64 (m, 1H) 4.37 (br. s., 1H) 3.10-3.40 (m, 3H) 2.92 (d, J=13.85 Hz, 1H) 2.11-2.88 (m, 5H) 1.75-1.95 (m, 2H) 1.55-1.71 (m, 1H).

Provenance & Evidence