Ethanol → HCID 23019672, compound

Participants

Reaction Steps

318 mg of ethyl 1-cyclopropyl-8-[4-fluoro-5-(tetrahydropyran-2-yloxy)-thiophen-2-yl]-9-methyl-4-oxo-4H-quinolizine-3-carboxylate (Example 101) was dissolved in 5 ml of tetrahydrofuran. 5 ml of ethanol and 43.0 mg of pyridinium p-toluenesulfonate were added to the obtained solution, and they were heated under reflux for 3 hours. The reaction mixture was poured into saturated aqueous sodium hydrogencarbonate solution. After the extraction with ethyl acetate, the organic layer was washed with water and then with saturated aqueous sodium chloride solution, and then dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure, and the obtained residue was purified by the silica gel column chromatography (eluent: chloroform/ethyl acetate=5/1) to obtain 230 mg of ethyl 1-cyclopropyl-8-(4-fluoro-5-hydroxymethylthiophen-2-yl)-9-methyl-4-oxo-4H-quinolizine-3-carboxylate.

Provenance & Evidence