Triethylamine → 3-Benzo[1,3]dioxol-5-yl-2-(6-hydroxy-benzofuran-2-carbonyl)-1,2,3,4-tetrahydro-pyrrolo[3,4-b]quinolin-9-one

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To a solution of 6-hydroxy-2-benzofuranoic acid (0.054 g, 0.3 mmol) in tetrahydrofuran (5 mL) at 0° C. was added dropwise oxalyl chloride (0.046 g, 0.36 mmol) followed by DMF (2 drops). The solution was warmed to 25° C. and stirred for 30 min, then concentrated in vacuo. The residue was dissolved in tetrahydrofuran (5 mL), and added to a solution of 1,2,3,4-tetrahydro-3-(3,4-methylenedioxyphenyl)-9H-pyrrolo-[3,4-b]quinolin-9-one (0.092 g, 0.3 mmol) (prepared as in Example 5) in THF (5 ml), triethylamine (0.045 g, 0.45 mmol) and 4-dimethylaminopyridine (0.01 g, cat.). The solution was stirred for 20 h at 25° C., and then concentrated in vacuo. The resulting crude residue was purified by silica gel column chromatography, eluting with 3% methanol in dichloromethane, to yield the product as a clear oil.

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