Tetrahydrofuran → 1-{[2-(5-{1-[4-(Cyclopropylsulfonyl)phenyl]-2-(tetrahydro-2h-pyran-4-yl)ethyl}-1h-pyrrol-2-yl)-1,3-thiazol-5-yl]methyl}piperidin-4-one hydrochloride

Participants

Reaction Conditions

Reaction Steps

To a mixture of [2-(5-{1-[4-(cyclopropylsulfonyl)phenyl]-2-(tetrahydro-2H-pyran-4-yl)ethyl}-1H-pyrrol-2-yl)-1,3-thiazol-5-yl]methanol (0.30 g), N,N-dimethylformamide (two drops) and tetrahydrofuran (6 mL) was added thionyl chloride (0.09 mL) at 0° C. The reaction mixture was stirred at 0° C. for 1 hr and concentrated. The obtained residue was dissolved in tetrahydrofuran (2 mL) and the solution was added to a mixture of piperidine-4,4-diol hydrochloride (0.19 g), potassium carbonate (0.17 g) and N,N-dimethylformamide (6 mL) at 0° C. The reaction mixture was stirred at room temperature overnight, water was added, and the mixture was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated brine, dried (MgSO4) and concentrated. The residue was subjected to basic silica gel column chromatography to give a yellow amorphous solid from a fraction eluted with tetrahydrofuran-hexane (3:1, volume ratio). The obtained amorphous solid was dissolved in ethyl acetate, and 4M hydrogen chloride-ethyl acetate solution (1.0 mL) was added. The precipitated crystals were collected by filtration, and dried to give the title compound (0.21 g, yield 57%) as yellow crystals. melting point 146-148° C. MS: 554 (MH+).

Provenance & Evidence