5-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-amine → HCID 46218606, compound

Participants

Reaction Conditions

Reaction Steps

Argon gas was bubbled through a mixture of 2-chloro-4-morpholinobenzofuro[3,2-d]pyrimidine (ASA75) (80 mg, 0.276 mmol, 1.0 eq) and 2-Aminopyridine-5-boronic acid pinacol ester (MW 220) (243 mg, 1.10 mmol, 4.0 eq) in 1,2 dimethoxyethan and 2 M Na2CO3 (3:1) (6 mL) for 5 min. dichioro 1,1-bis(diphenylphosphino)ferrocene-palladium(II) dichloromethane complex (MW 732) (5.05 mg, 0.00690 mmol, 0.025 eq) was added and the reaction mixture was heated to reflux (90° C.) for 14 h 45 min, cooled and diluted with EtOAc (9 mL). The organic solution was washed with a mixture of H2O:Na2CO3:NH4OH (conc. 32% in water)=5:4:1 (9 mL), then NH4Cl (sat.) and brine (2×), dried over Na2CO3, filtered and concentrated. Purification by silica gel chromatography (gradient from=% MeOH in DCM to 5% MeOH in DCM) gave a colorless solid (4.40 mg, 5%).

Provenance & Evidence