Trimethyl orthoformate → HCID 67045111, compound

Participants

Reaction Steps

(R)-N-(4-(3-Aminopiperidin-1-yl)-5-bromo-1H-pyrrolo[2,3-b]pyridin-3-yl)nicotinamide hydrochloride (0.075 g, 0.14 mmol, Example 1A), trimethyl orthoformate (0.32 mL, 2.9 mmol), and DIEA (0.100 mL, 0.57 mmol; d 0.742) were placed in MeOH (3 mL). Cyclopropanecarbaldehyde (0.022 mL, 0.29 mmol) was then added, and the reaction was stirred at room temperature for 18 hours. NaBH4 (0.014 g, 0.36 mmol) was then added, and the reaction was stirred for 1 hour. The reaction was then poured into water, and extracted with DCM. The combined organic fractions were dried (MgSO4), filtered, and concentrated to give the crude product, which was purified by reverse phase HPLC (0-50% ACN in water, Gilson system). The purified product was then dissolved in DCM (with minimal MeOH to aid solubility) and added dropwise to a stirring solution of 1M HCl in ether. The resulting solid was filtered, dried and collected to give (R)-N-(5-bromo-4-(3-(cyclopropylmethylamino)piperidin-1-yl)-1H-pyrrolo[2,3-b]pyridin-3-yl)nicotinamide hydrochloride salt (0.050 g, 60% yield). 1H NMR (400 MHz, D2O) δ 8.98-8.98 (m, 1H), 8.65-8.64 (m, 1H), 8.52-8.50 (m, 1H), 8.12 (s, 1H), 7.74-7.71 (m, 1H), 7.27 (s, 1H), 3.54-3.51 (m, 1H), 3.18-3.04 (m, 3H), 2.97-2.92 (m, 1H), 2.69-2.55 (m, 2H), 1.82-1.78 (m, 1H), 1.55-1.52 (m, 1H), 1.40-1.30 (m, 1H), 1.21-1.17 (m, 1H), 0.74-0.68 (m, 1H), 0.36-0.32 (m, 2H), 0.05-0.00 (m, 2H); LCMS (APCI+) m/z 469, 471 (M+H)+.

Provenance & Evidence