7-Chlorothieno[3,2-b]pyridine → HCID 59424433, compound

Participants

Reaction Steps

To a solution of 2 (1.14 g, 6.76 mmol) in THF (60 ml) was added, at −78° C., n-BuLi (3.38 ml, 2.5 M soln in hexanes) and the reaction mixture was stirred at the same temperature for 10 min. A solution of ZnCl2 (16.9 ml, 2.5 ml, 0.5M in THF) was added and the reaction mixture was warmed to room temperature. Then a solution of 1-ethyl-4-iodo-5-methyl-1H-imidazole (800 mg, 3.38 mmol) (Pyne, S. G and Cliff, M. D. Synthesis 1994, 681) and Pd(PPh3)4 (390 mg, 0.34 mmol) in THF (15 ml) were added and the reaction mixture was refluxed for 3 hrs, cooled to room temperature, quenched with conc. ammonium hydroxide solution and made neutral with concentrated aqueous HCl. The neutral solution was extracted with EtOAc, the extract was collected, dried over anhydrous sodium sulfate, and filtered. The filtrate was evaporated and the residue was purified by column chromatography (eluent MeOH:EtOAc, 1:9) to afford the title compound 87 (1.1 g, 100% yield) as a brown oil. MS (m/z) 278.0/280.0 (M+H).

Provenance & Evidence