Toluene → 4-Cyanomethyl-8-fluoro-3-oxo-3,4-dihydro-2H-quinoxaline-1-carboxylic acid 2-methyl-4-(2,3,4,5-tetrahydrobenzo[b]azepine-1-carbonyl)benzylamide

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Reaction Steps

To a solution of (5-fluoro-2-oxo-3,4-dihydro-2H-quinoxalin-1-yl)acetonitrile from Example 13A (183 mg, 0.89 mmol) in THF (2 ml) were added a solution of phosgene in toluene (20%, 0.61 ml, 1.2 mmol) and diisopropylethylamine (200 μl, 1.2 mmol). The mixture was stirred for 2 h. To the mixture were added a solution of (4-aminomethyl-3-methylphenyl)-(2,3,4,5-tetrahydrobenzo[b]azepin-1-yl)methanone from Example F (260 mg, 0.89 mmol) in THF (2 ml) and diisopropylethylamine (155 μl, 0.89 mmol). The mixture was stirred for 2 h and evaporated in vacuo. The residue was purified by flash column chromatography on silica (eluant EtOAc:pet. ether 80:20 to EtOAc 100%) to give a white solid; yield 268 mg, 57%.

Provenance & Evidence