Hydrochloric Acid → 3-{8-[4-(Morpholine-4-carbonyl)-phenylamino]-imidazo[1,2-a]pyrazin-6-yl}-benzoic acid

Participants

Reaction Conditions

Reaction Steps

The bromide (8) (2,46 mmol) is dissolved in 10 mL DME (ethylene glycol, dimethyl ether) in a sealable pressure vessel and N2 is bubbled through for 10 min. Tetrakis(triphenylphosphine)palladium (0.24 mmol) is added and N2 is bubbled through the reaction for another 10 minutes. 3-Carboxyphenyl boronic acid (3.1 mmol) and 1N Na2CO3 solution (10 mL) are then added, the vessel sealed, and the reaction heated to 95° C. for 16 hrs. with vigorous stirring. After cooling to room temperature, the reaction is acidified to pH 3 with 1N HCl and extracted with ethyl acetate (3×25 mL). The pooled ethyl acetate layers are washed with brine, dried over sodium sulfate, and the solvent removed in vacuo. The resulting solid is then dissolved in a minimal volume of CH2Cl2 and precipitated out as a whitish-tan solid by slow addition of ethyl acetate (5 mL) followed by hexanes (30 mL) to yield 3-{8-[4-(Morpholine-4-carbonyl)-phenylamino]-imidazo[1,2-a]pyrazin-6-yl}-benzoic acid (9).

Provenance & Evidence