反应详情

The 4-hydroxy-5-methyl-5-phenyl-3-phenylmethoxy-2-(5H)-furanone (1.2 g) was subjected to hydrogenation over 100 mg of 5% Pd/BaSO4 in 100 mL of MeOH at room temperature and under 30 psi H2. The reaction was monitored periodically by TLC analysis. The suspension was filtered through two #1 filter papers, concentrated to a white solid and recrystallized from MeOH/H2O to give 3,4-dihydroxy-5-methyl-5-phenyl-2(5H)-furanone as a white crystalline material: mp 173-175° C. dec. 1H NMR (acetone-d6) δ 7.53-7.36 (m, 5H), 1.84 (s, 3H). Anal Calcd for C11H10O4 +0.125H2O): C, 63.38; H, 4.96. Found: C, 63.30; H, 4.96.

1. filtrationThe suspension was filtered through two #1
2. filtrationfilter papers
3. concentrationconcentrated to a white solid
4. customrecrystallized from MeOH/H2O