反应详情

2,2,4,6,7-Pentamethyl-5-nitro-3-phenyl-2,3-dihydrobenzofuran (2.0 g, 6.4 mmol) was dissolved in ethanol (15 ml) and the solution was subjected to catalytic reduction using 5% palladium carbon (2.0 g) as a catalyst. After the catalyst was filtered off, the filtrate was concentrated. The residue was purified by column chromatography on silica gel (isopropyl ether) and then crystallized from hexane to obtain the desired compound (1.33 g, yield: 73.6%), m.p. 131°-132° C.

1. filtrationAfter the catalyst was filtered off
2. concentrationthe filtrate was concentrated
3. customThe residue was purified by column chromatography on silica gel (isopropyl ether)
4. customcrystallized from hexane