反应详情

Substantially the same procedure as in Example 1 was repeated using 3',4',5'-trimethoxyacetophenone (2.1 g) and 5-methylindole-3-carboxaldehyde (1.59 g) except that the reaction solution was concentrated under reduced pressure, that the residue was purified by silica gel column chromatography, and that the obtained crude crystals were recrystallized from a mixed solvent of ethyl acetate and hexane, to give Compound 20 (1.16 g).

1. concentrationwas concentrated under reduced pressure, that the residue
2. customwas purified by silica gel column chromatography
3. customthat the obtained crude crystals
4. customwere recrystallized from a mixed solvent of ethyl acetate and hexane