Methanol, magnesium salt (2:1) → HCID 69058481, compound

Participants

Reaction Conditions

Reaction Steps

To a stirred suspension of ethyl 6-(3-chloro-4-fluorobenzyl)-3,4-dihydroxy-5-oxo-5,6,7,8-tetrahydro-2,6-naphthyridine-1-carboxylate (40 g) in DMF (200 mL) was added magnesium methoxide in methanol (100 mL). The mixture heated at 40-50° C. for 3 hours. The excess methanol distilled off, and methyl tosylate (18 mL) was added. The reaction mixture was heated at 50° C. overnight, then cooled to 25° C., and then quenched into 1N HCl (100 mL). The suspension stirred for 1 hour at ambient temperature. The product was isolated by filtration, and the filter cake washed with water (2×100 mL) and then dried on the filter under an atmosphere of nitrogen. The crude product was suspended in methanol (460 mL), heated at reflux temperature for 1 hour, and then allowed to cool to ambient temperature. The product was isolated by filtration and the filter cake washed with cold methanol (2×40 mL) and dried to give the title product.

Provenance & Evidence