Water → 6-Acetyl-3,4-dihydro-2,2-dimethyl-trans-4-(2-oxo-1-pyrrolidinyl)-2H-benzo[b]pyran-3-ol

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Reaction Steps

6-Acetyl-3,4-dihydro-2,2-dimethyl-3,4-epoxy-2H-benzo[b]pyran (0.33 g, prepared as described in Example 1 of U.K. Pat. No. 1,511,187), and 2-pyrrolidone (0.15 g), were stirred in dimethylsulphoxide (25 ml) under nitrogen at room temperature. Sodium hydride (0.5 g, 80%) was added during 2 mins and the reaction stirred for a further 22 hours. Addition of water, extraction with ethyl acetate, drying of the organic layer with magnesium sulphate, filtration, evaporation and recrystallisation from ethyl acetate gave the title compound (0.04 g) of m.p. 218°-219°.

Provenance & Evidence