Nicotinic Acid → N-(5-bromo-4-fluoro-1H-pyrrolo[2,3-b]pyridin-3-yl)nicotinamide

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Reaction Steps

A solution of 5-bromo-4-fluoro-1H-pyrrolo[2,3-b]pyridin-3-amine (3.0 g, 13 mmol) in CH2Cl2 (200 mL) was treated with nicotinic acid (3.2 g, 26 mmol), bis(2-oxooxazolidin-3-yl)phosphinic chloride (6.6 g, 26 mmol) and triethylamine (6.6 g, 65 mmol). The reaction was stirred at room temperature for 1 hour, and then 3M aqueous LiOH (4 mL) was added. The reaction was stirred for 1 hour, and then saturated aqueous Na2CO3 was added (200 mL). The aqueous phase was extracted with CH2Cl2 (1×200 mL), and the aqueous phase was filtered. The filtered cake was dried to yield N-(5-bromo-4-fluoro-1H-pyrrolo[2,3-b]pyridin-3-yl)nicotinamide (3.5 g, 80% yield). 1H NMR (400 MHz, (CD3)2SO) δ 9.09 (d, 1H), 8.72 (dd, 1H), 8.32 (d. 1H), 8.26 (d, 1H), 7.50 (dd, 1H); LCMS (APCI+) m/z 336.9 (M+H)+, Retention time=2.19 minutes (Method 1).

Provenance & Evidence