Cesium carbonate → HCID 178434531, compound

Participants

Reaction Conditions

Reaction Steps

(5-Bromo-thiophen-3-yl)-(4,4-dimethyl-azepan-1-yl)-methanone (0.105 g, 0.33 mmol) together with 3-methyl-4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-1H-pyrazole (83 mg, 0.4 mmol), caesium carbonate (0.150 g, 0.46 mmol), and palladium tetrakis(triphenylphosphine) (0.057 g, 0.05 mmol) in DME (3 mL), IMS 1 mL) and water (0.5 mL) was degassed then heated by microwave irradiation to 140° C. for 20 minutes. Further quantities of 3-methyl-4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-1H-pyrazole (0.035 g), caesium carbonate (0.054 g), and palladium tetrakis(triphenylphosphine) (19 mg) were added and the mixture was heated by microwave irradiation to 140° C. for 20 minutes before diluting with water and extracting with DCM (×3). The organic solution was dried over sodium sulfate, filtered and the solvent evaporated. The residue was purified by chromatography on a silica II cartridge, eluting with 10-60% ethyl acetate in cyclohexane and then was further purified by HPLC using a phenyl hexyl column, eluting with 15%-95% acetonitrile in water (0.1% formic acid) over 20 minutes. The fractions containing the desired product were freeze-dried then taken up as a solution in methanol and dried to give the title compound as a colourless semi-solid (0.016 g). LCMS m/z 318.28 [M+H]+ R.T.=9.29 min (Analytical Method 2).

Provenance & Evidence