Dimethylformamide → 1-Butyl-1,4,7,8,9,10-hexahydro-7-methanesulfonyl-pyrido[3,2-f]quinoxaline-2,3-dione

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Reaction Steps

The product from Example 89 (0.12 g, 0.45 mmol) was solubilized in a minimal amount of dimethylformamide and then treated with 2 mL dichloromethane, methanesulfonyl chloride (0.17 g) and triethylamine (0.15 g). After stirring at room temperature for 4 h, the mixture was washed with water, dried over sodium sulfate, filtered and evaporated. The residue was purified by silica gel chromatography (4:1 heptane:ethyl acetate as eluant) to give the title compound (30 mg, 17% yield).

Provenance & Evidence