Hydrochloric Acid → 5-(8-azetidin-3-yl-4,5-dihydro-6-oxa-1-thia-benzo[e]azulen-2-yl)-1-(2,4-difluoro-phenyl)-1H-[1,2,4]triazole

Participants

Reaction Conditions

Reaction Steps

5-(8-bromo-4,5-dihydrobenzo[b]thieno[2,3-d]oxepin-2-yl)-1-(2,4-difluorophenyl)-1H-1,2,4-triazole (300 mg, 0.6 mmol) was dissolved in N,N-dimethyacetamide and purged with nitrogen. Added [1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium(II) complex with dichloromethane (1:1) (30 mg, 0.04 mmol) and copper(I)iodide (10 mg, 0.08 mmol). Bubbled in nitrogen for 10 minutes. Added (1-(tert-butoxycarbonyl)azetidin-3-yl)zinc(II) iodide (230 mg, 0.65 mmol) in 2.3 mL DMA. Heated at 80° C. overnight. Complete reaction was confirmed by LCMS. Diluted reaction mixture with 1 M HCl and extracted the t-Boc protected intermediate, tert-butyl 3-(2-(1-(2,4-difluorophenyl)-1H-1,2,4-triazol-5-yl)-4,5-dihydrobenzo[b]thieno[2,3-d]oxepin-8-yl)azetidine-1-carboxylate, with ethyl acetate. Dried over magnesium sulfate and concentrated in vacuo. Purified by flash chromatography (0 to 50% ethyl acetate in hexanes). Concentrated in vacuo and re-dissolved the residue in 10 mL 1,4-dioxane. Added 5 mL 4 N HCl in dioxane and let stir for 2 hours. Complete deprotection was confirmed by LCMS. Concentrated in vacuo purified by HPLC to give 419 (21.1 mg, 7% yield, M=1 437.1).

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