Diethyl Ether → tert-butyl 4-(2-(4-(7-chlorothieno[3,2-b]pyridin-2-yl)-1H-imidazol-1-yl)ethyl)piperazine-1-carboxylate

Participants

Reaction Steps

To a stirred solution of 7-chlorothieno[3,2-b]pyridine (2.95 g, 17.39 mmol) in THF (60 ml) at −15° C. was added n-BuLi (2.5M, 6.96 ml, 17.39 mmol). After 30 min, a solution of ZnCl2 in Et2O (1M, 17.39 mL, 17.39 mmol) was added at −15° C. and the reaction mixture was warmed to RT over 45 min. A solution of palladium tetrakistriphenylphosphine (0.268 g, 0.232 mmol) and 304 (4.71 g, 11.59 mmol) in THF (18 ml) was added and the mixture was heated to reflux for 1 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 a mixture of MTBE/Hexane, to afford the title compound 305 (3.75 g, 8.37 mmol, 72% yield) as a beige solid. MS (m/z): 448.46 (M+H).

Provenance & Evidence