1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → 5-(2-Fluoro-4-iodo-phenylamino)-imidazo[1,5-a]pyridine-6-carboxylic acid ((S)-2,2-dimethyl-[1,3]dioxolan-4-ylmethoxy)-amide

Participants

Reaction Steps

To a solution of 5-(2-fluoro-4-iodo-phenylamino)-imidazo[1,5-a]pyridine-6-carboxylic acid (326 mg, 0.82 mmol) in THF (4.1 ml) was added O—((R)-2,2-dimethyl-[1,3]dioxolan-4-ylmethyl)-hydroxylamine (362 mg, 2.46 mmol), DIPEA (1.26 ml, 7.4 mmol), HOBt (327 mg, 2.46 mmol) and EDCI (471 mg, 2.46 mmol), the mixture stirred for 18 hours at ambient temperature. The reaction mixture was diluted with ethyl acetate and washed with a saturated aqueous solution of sodium bicarbonate followed by water and then brine. The organic phase was isolated, dried (Na2SO4), filtered and concentrated in vacuo. Purification of the resultant residue by flash chromatography (Si-PPC, gradient 0% to 10%, methanol in dichloromethane) afforded the title compound as a pale yellow solid (364 mg, 84%). LCMS (method B): RT=2.58 min, [M+H]+=527.

Provenance & Evidence