2-Methyl-3-butyn-2-ol → HCID 86693487, compound

Participants

Reaction Conditions

Reaction Steps

Into a pressure tube containing a solution 9-bromo-8-fluoro-3,4,5,6-tetrahydro-4,6-methanobenzo[3,4]cyclohepta[1,2-d]imidazole-2-carboxamide (47 mg, 0.14 mmol) in 1:1 N,N-dimethylformamide/triethylamine (0.8 mL) was introduced 2-methyl-3-butyn-2-ol (235 mg, 2.80 mmol), copper(I) iodide (2 mg, 0.01) and nitrogen gas bubbled through the solution for 3 minutes. Bis(triphenylphosphine)palladium(II) chloride (10 mg, 0.01 mmol) was added and nitrogen bubbling continued a further two minutes before the pressure tube was closed under nitrogen. The reaction mixture was warmed to 80° C. for 8 hr. After cooling to room temperature, the reaction mixture was evaporated in vacuo and the residue re-dissolved in ethyl acetate (15 mL). This solution was washed with water (2×5 mL) and brine (5 mL). The organic extract was dried over sodium sulfate, filtered and the filtrate absorbed onto silica gel. Purification by silica gel flash column chromatography (eluent: dichloromethane containing a 0-8% gradient of methanol) furnished partially purified product as a brown oil. After several acetonitile solubilisation-evaporation (in vacuo) cycles, a grey-brown solid was obtained which was slurried in acetonitrile (0.4 mL) and collected by filtration to furnish the title compound (13 mg, 0.038 mmol, 27%) as a grey solid: 1H NMR (500 MHz, d4-methanol) δ 1.59 (s, 6H), 1.63 (d, J=11.03 Hz, 2H), 2.85-2.95 (m, 2H), 3.44 (td, J=6.94, 3.78 Hz, 1H), 3.63 (td, J=8.04, 3.78 Hz, 1H), 6.86 (d, J=10.40 Hz, 1H), 8.25 (d, J=7.57 Hz, 1H); M+1=340.

Provenance & Evidence