Tetrahydrofuran → HCID 12952273, compound

Participants

Reaction Steps

45.0 g of 2-benzoyloxy-7-bromo-1,2,3,4-tetrahydro-9-oxo-xanthene obtained in Example 4 was suspended in a mixed solution of 240 ml of tetrahydrofuran and 90 ml of methanol. To the suspension was added dropwise at room temperature 45 ml of an aqueous solution containing 7.0 g of potassium hydroxide. After stirring the resulting solution for two hours, the solvent was removed by distillation. To the thus obtained crystals was added 300 ml of water, and the mixture was thoroughly agitated and filtered. The filtrate was recrystallized from ethanol to obtain 26.6 g (yield: 79.8%) of 7-bromo-2-hydroxy-1,2,3,4-tetrahydro-9-oxo-xanthene as light yellowish prism-like crystals.

Provenance & Evidence