Lactic Acid → HCID 66606717, compound

Participants

Reaction Steps

A stirred yellow suspension of 5-(2-diethylamino-ethyl)-2-(5-fluoro-2-oxo-1,2-dihydro-indol-3-ylidenemethyl)-3-methyl-1,5,6,7-tetrahydro-pyrrolo[3,2-c]pyridin-4-one (193 mg, 0.47 mmol) obtained form Example 1 in methanol (8 ml) and dichloromethane (16 ml) was added with lactic acid (40 μl, 0.47 mmol) at room temperature. The resulting solution was stirred for 30 minutes. The solvent was evaporated under reduced pressure and the residue was added with 10 ml of acetonitrile. The resulting solution was heated to reflux for 45 minutes, cooled down to room temperature and filtered. The filter cake was washed with cold acetonitrile (0.5 ml×3) and ethanol (0.5 ml×3) and dried in vacuo to give the title compound 5-(2-diethylamino-ethyl)-2-(5-fluoro-2-oxo-1,2-dihydro-indol-3-ylidenemethyl)-3-methyl-1,5,6,7-tetrahydro-pyrrolo[3,2-c]pyridin-4-one lactate (208 mg, 88.9%) as a yellow solid.

Provenance & Evidence