p-Bromoacetophenone → HCID 24987026, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 1-methyl-2-cyanopyrrole (1.6 g, 15 mmol) and triisopropyl borate (7.0 mL, 30 mmol) in THF (45 mL) at 0° C. was added lithiumdiisopropylamide (LDA—2.0 M in heptane/THF/ethylbenzene, 13.3 mL, 26.6 mmol) in a dropwise fashion over 45 minutes. The resulting solution was stirred at 0° C. for 1 hour. To the solution was added 1-(4-bromophenyl)-ethanone (1.0 g, 5 mmol) dissolved in glyme (45 mL), sodium carbonate (1.59 g, 15 mmol) dissolved in water (9 mL), and tetrakis(triphenylphosphine) palladium (0) (0.28 g, 0.25 mmol). The resulting solution was heated to reflux for 1.5 hours. The solution was cooled to room temperature and partitioned between a saturated ammonium chloride solution (50 mL) and ethyl acetate (80 mL). The organic layer was separated, dried over magnesium sulfate, filtered, and concentrated. The residue was purified on a silica gel column (20% ethyl acetate in hexane) and triturated with ether to give 5-(4-acetylphenyl)-1-methyl-1H-pyrrole-2-carbonitrile as a yellow solid (0.62 g, 55%). MS (ES) m/z 225.1; HRMS: calcd for C14H12N2O+H+, 225.1022; found (ESI, [M+H]+), 225.1039.

Provenance & Evidence