7-Chlorothieno[3,2-b]pyridine → 2-(5-(1,3-Dioxan-2-yl)-1-methyl-1H-imidazol-2-yl)-7-chlorothieno[3,2-b]pyridine

Participants

Reaction Steps

To a solution of 7-chlorothieno[3,2-b]pyridine (1) [Klemm, L. H.; Louris, J. N.; Boisvert, W.; Higgins, C.; Muchiri, D. R.; J. Heterocyclic Chem., 22, 1985, 1249-1252] (11.7 g, 69.0 mmol) in THF (300 mL) was added, at −78° C., a solution of n-BuLi (30.46 mL, 76 mmol, 2.5 M in hexanes) and the reaction mixture was stirred for 10 min. A solution of ZnCl2 (76.15 mL, 76 mmol, 1.0 M in Et2O) was added and the mixture was stirred at RT for 10 min. Pd(PPh3)4 (2.287 mg, 0.104 mmol) was added along with a solution of 39 (5.82 g, 19.79 mmol) in THF (20 mL) and the reaction mixture was heated to reflux under an atmosphere of N2 gas for 4 hours. The reaction was then cooled to RT, and diluted with ammonium hydroxide and EtOAc. The organic phase was collected, dried over Na2SO4, filtered and concentrated. The resultant material was triturated with Et2O to afford the title compound 40 (5.79 g, 87% yield) as a white solid. MS (m/z): 336.1 (M+H).

Provenance & Evidence