Acetyl chloride → 2-(5-amino-7-bromo-3-chloro-1-fluoro-5H-chromeno[2,3-c]pyridin-5-yl)ethanol

Participants

Reaction Conditions

Reaction Steps

To a solution of N-(7-bromo-3-chloro-1-fluoro-5-(2-hydroxyethyl)-5H-chromeno[2,3-c]pyridin-5-yl)-2-methylpropane-2-sulfinamide (5.8 g, 12.14 mmol) in dry MeOH (100 mL) at −20° C. was added a mixture of MeOH (80 mL)/acetylchloride (20 ml). The resulting reaction mixture was stirred at −20° C. for 30 min and then quenched with 10% aqueous solution of Na2CO3. DCM was added, the organic phase was separated and dried over Na2SO4. The solution concentrated under reduced pressure and the residue was purified by chromatography (0-50% EtOAc/hexanes) to afford 2-(5-amino-7-bromo-3-chloro-1-fluoro-5H-chromeno[2,3-c]pyridin-5-yl)ethanol (4.0 g, 10.71 mmol, 88% yield) as a light yellow solid-foam.

Provenance & Evidence