Thermal ene reactions of alloxan and 1,3-dimethylalloxan
作者:G Bryon Gill、Muhammad S.Hj Idris
DOI:10.1016/s0040-4020(01)80521-4
日期:1993.1
prepared from their hydrates, respectively 3 and 4, by either chemical removal of the water (acetic anhydride in boiling aceticacid) or by azeotropic drying using chlorobenzene as solvent. The central CO groups of these triones are extremely electrophilic and ene addition occurs at these sites with a wide range of alkenes and with terminal alkynes in aprotic solvents at moderate temperatures (100–130°C)