Abstract
The reaction of 2-[3(4)-nitrophenyl]-5,5-dichloromethyl-1,3-dioxanes with potassium 4-aminobenzoate in dimethylformamide gave {2-[3(4)-nitrophenyl]-5-chloromethyl-1,3-dioxan-5-yl}methyl 4-aminobenzoates as the monosubstitution products, which react with maleic anhydride in acetone to form the corresponding maleic acid monoamides. Cyclization of the latter upon boiling in a solution of a mixture dimethylformamide and toluene in the presence of p-toluenesulfonic acid and azeotropic distillation of water yielded new {2-[3(4)nitrophenyl]-5-chloromethyl-1,3-dioxan-5-yl}methyl 4-(2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)benzoates.
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