HCID 4736910, compound → 3,4-Dihydro-2H-naphtho[1,2-b]pyran-2-carboxylic acid

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Reaction Steps

A mixture of 4-oxo-4H-naphto[1,2-b]pyran-2-carboxylic acid (12 g) and 2-methoxyethanol (100 ml) was hydrogenated at normal pressure and at room temperature in the presence of palladium on activated carbon 10% (2 g) as a catalyst. After the calculated amount of hydrogen was taken up, the catalyst was filtered off and the filtrate was evaporated, yielding 7 g (61.4%) of 3,4-dihydro-2H-naphto[1,2-b]pyran-2-carboxylic acid (interm. 9-a).

Provenance & Evidence