Methyl [4-methoxy-3-(methyl­sulfonyl­oxy)­benzoyl]­formate

The crystal structure of the title compound, C₁₁H₁₂O₇S, confirms an earlier proposal concerning the regioselectivity of electrophilic substitution reactions of mesyl guaiacol.

4-(3-Hydroxy-4-methoxy­phenyl)-3-(3,4,5-tri­methoxy­phenyl)-2,5-di­hydro-1H-pyrrole-2,5-dione

The title compound, C₂₀H₁₉NO₇, crystallizes in the space group Pna2₁. X-ray analysis shows the compound has the desired 3'-hydroxy and 4'-methoxy substitution pattern, as in the natural template combretastatin A-4.

3-(1H-Indol-3-yl)-4-(3,4,5-tri­methoxy­phenyl)-2,5-di­hydro-1H-pyrrole-2,5-dione

The crystal structure of the title compound, C₂₁H₁₈N₂O₅, was determined in order to study the electrocyclic reactivity of 3,4-di­aryl-1H-pyrrole-2,5-dione derivatives. Intermolecular hydrogen bonds form sheets.

5,6,7-Tri­methoxy-2,3-di­hydro-1H,8H-benzo­[a]­pyrrolo­[3,4-c]­carbazole-1,3-dione di­methyl sulfoxide solvate

The crystal structure of the title compound, C₂₁H₁₆N₂O₅·C₂H₆OS, was determined to investigate the electrocyclic reactivity of 3,4-di­aryl-1H-pyrrole-2,5-diones (3,4-bisarylmal­eimides) to the yield corresponding carbazole derivatives.