7-Chlorothieno[3,2-b]pyridine → HCID 66599084, compound

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Reaction Steps

To a solution of 7-chlorothieno[3,2-b]pyridine 6 (7.37 g, 43.4 mmol, 1.5 eq) in THF (70 mL) at −10° C. in a 250 mL round-bottom flask was added n-BuLi (17.38 mL, 43.4 mmol, 1.5 eq). After 1 h, ZnCl2 (1M in ether) (43.4 mL, 43.4 mmol, 1.5 eq) was added at −10° C. and the reaction mixture was allowed to warm up to r.t. After 1 h, Pd(PPh3)4 (0.669 g, 0.579 mmol, 0.02 eq) and bromide 10 (10 g, 29 mmol, 1 eq) in THF (10.5 mL) were added and the mixture was heated to reflux for 1 h. After cooling to room temperature the reaction mixture was concentrated to dryness. DCM (200 mL)/water (160 mL)/NH4OH (40 mL) were added to the solid and the resultant mixture (an emulsion) was stirred for 1 h. Brine (50 ml) was added to the emulsion and the stirring was continued for an additional 10 min. The mixture was then filtered through a paper filter and phases were separated. The aqueous phase was extracted with DCM (2×50 mL). The organic phases were combined, dried over Na2SO4 and concentrated to dryness. MTBE (30 mL) was added to the solid and the suspension was stirred for 30 min. The solid was collected by filtration, washed with MTBE (2×5 mL) and dried to afford of 11 as a beige solid (8.02 g, 64% yield). MS (m/z): 434.2 (M+1).

Provenance & Evidence