Lithium diisopropylamide → 1-(5-Bromopyridin-2-yl)-1-[5-(3-methyl-5-{[4-(trifluoromethyl)pyridin-2-yl]amino}phenyl)-1,3-thiazol-2-yl]ethanol

Participants

Reaction Conditions

Reaction Steps

THF (20 ml) was cooled to −78° C., and lithium diisopropylamide (7.64 ml, 13.75 mmol) was added. N-[3-methyl-5-(1,3-thiazol-5-yl)phenyl]-4-(trifluoromethyl)pyrimidin-2-amine (INTERMEDIATE 4, 1.85 g, 5.50 mmol) in THF (15 ml) was added drop wise, and the reaction was stirred at −78° C. for 30 min. 1-(5-Bromopyridin-2-yl)ethanone (1.100 g, 5.50 mmol) in THF (5 ml) was subsequently added in one portion. The reaction was stirred for 10 min at −78° C. The dry ice bath was removed, and the reaction was allowed to warm to room temperature. The dark brown reaction mixture was quenched with aqueous saturated NH4Cl solution and extracted with EtOAc (2×). The combined organic layers were washed with brine, dried (MgSO4), filtered and evaporated. Chromatography on silica gel (Biotage 100 g SNAP, 0-20% EtOAc/toluene) afforded 1-(5-bromopyridin-2-yl)-1-[5-(3-methyl-5-{[4-(trifluoromethyl)pyridin-2-yl]amino}phenyl)-1,3-thiazol-2-yl]ethanol (1.487 g, 2.77 mmol, 50.4% yield) as a yellow solid. MS ESI: [M+H]+ m/z 538.0.

Provenance & Evidence