Bromoacetonitrile → 2-((5-amino-7-bromo-3-chloro-8-fluoro-5H-chromeno[2,3-b]pyridin-5-yl)methoxy)acetonitrile

Participants

Reaction Steps

A solution of (5-amino-7-bromo-3-chloro-8-fluoro-5H-chromeno[2,3-b]pyridin-5-yl)methanol (2.83 g, 7.87 mmol) and bromoacetonitrile (5.48 mL, 79 mmol) in 16 mL THF was heated to 40° C. and treated drop wise with lithium tert-butoxide [1N in THF (79 mL, 79 mmol)] over a time period of 4 hours. After completed addition the reaction mixture was concentrated under reduced pressure. Purification of the crude residue by column chromatography [0-40% (95:5 EtOAc/MeOH)/DCM] gave 2-((5-amino-7-bromo-3-chloro-8-fluoro-5H-chromeno[2,3-b]pyridin-5-yl)methoxy)acetonitrile (1.362 g, 3.42 mmol, 43.4% yield).

Provenance & Evidence