Lithium iodide → 1-(2,4-Dimethoxy-benzyl)-2-oxo-1,2-dihydro-pyridine-3,4-dicarboxylic acid 4-ethyl ester

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Reaction Steps

A solution of 1-(2,4-dimethoxy-benzyl)-2-oxo-1,2-dihydro-pyridine-3,4-dicarboxylic acid 4-ethyl ester 3-methyl ester (18.4 g, 49.0 mmol) in 30 mL of pyridine was added to a refluxing mixture of LiI (26.2 g, 196 mmol) in 190 mL of pyridine. The resulting mixture was refluxed for 1 h. After the mixture was cooled to r.t., solvent was evaporated in vacuo. The residue was dissolved in water (200 mL) and acidified with 6M HCl to pH about 2. The resulting precipitate was collected by filtration. The crude product was purified by chromatography (100% EtOAc) to give 13.2 g of the title compound. MS: (+) m/z 384.29 (M+Na).

Provenance & Evidence