4-Benzyloxy-6-[2-(3,4-dibenzyloxyphenyl)-2-hydroxyethyl]-2H-pyran-2-one → 4-Hydroxy-6-[2-(3,4-dihydroxyphenyl)-2-hydroxyethyl]-2H-pyran-2-one

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Reaction Steps

35.6 g (66.6 mmol) 4-benzyloxy-6-[2-[3,4-dibenzyloxyphenyl)-2-hydroxy-ethyl)]-2H-pyran-2-one (VI) was hydrogenated for 6 hours at room temperature under a hydrogen pressure of 44 mbar in 1200 ml ethanol using 10 g W2 Raney nickel. After taking up 4.4 l hydrogen the catalyst was removed by suction filtration and it was rewashed several times with tetrahydrofuran. The evaporated filtrates yielded 12.2 g (70%) VII after triturating with ether, melting point 153° C. (decomp.).

Provenance & Evidence