7-Chlorothieno[3,2-b]pyridine → 2-(6-(1,3-Dioxan-2-yl)pyridin-3-yl)-7-chlorothieno[3,2-b]pyridine

Participants

Reaction Steps

To a stirred solution of 7-chlorothieno[3,2-b]pyridine (12.08 g, 71.2 mmol) in THF (138 mL) at −15° C. was added n-BuLi (30.7 mL, 77.0 mmol). After 30 min, a solution of ZnCl2 0.5 M in THF (142 mL, 71.2 mmol) was added at −15° C. and the reaction mixture was allowed to warm to RT over 45 min. A solution of palladium tetrakistriphenylphosphine (1.266 g, 1.096 mmol) and bromide 278 (13.37 g, 54.8 mmol) in THF (18.5 mL) was added and the mixture was heated to reflux for 2 h then concentrated. The residue was diluted with water and ammonium hydroxide and extracted with DCM. The organic layer was washed with brine, dried over anhydrous sodium sulfate, filtered and concentrated. The residue was triturated with MTBE to afford the title compound 279 (10.70 g, 32.2 mmol, 59% yield) as light brown solid. MS (m/z): 333.33 (M+H).

Provenance & Evidence