Triethylamine → 4-(1-Benzyl-2-methyl-4,5-dihydro-1H-1,3,6-triaza-benzo[e]azulene-6-carbonyl)-2-methyl-benzonitrile

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Reaction Steps

A mixture of 4-cyano-3-methyl-benzoic acid from Example E6 (557 mg, 3.4 mmol) and thionyl chloride (0.755 ml, 10.3 mmol) in toluene (100 ml) was heated at reflux for 2 h. After cooling to room temperature, solvents were re-moved in vacuo and azeotroped with toluene. The residue was redissolved in dichloromethane (100 ml) and triethylamine (0.962 ml, 6.9 mmol) then 1-benzyl-2-methyl-1,4,5,6-tetrahydro-1,3,6-triaza-benzo[e]azulene from Example E5a (1.0 g, 3.4 mmol) was added. The mixture was stirred at room temperature for 2 h, washed with saturated NaHCO3 then brine, dried and concentrated in vacuo. The residue was purified by flash chromatography on silica gel (eluant; 50% EtOAc:50% pet. ether then EtOAc) to yield the title compound (844 mg, 56%).

Provenance & Evidence