2-Aminopyrrole-2,5-diones 2. Vinyl nucleophilic substitution of the alkylamino group in 1-alkyl-3-alkylaminopyrrole-2,5-diones by arylamines

In vinyl nucleophilic substitution (SN vin) with the hydrochlorides or 4-toluenesulfonates of primary arylamines 1-alkyl-3-alkylaminopyrrole-2,5-diones form the corresponding 1-alkyl-3-arylaminopyrrole-2,5-diones, which are also produced in situ from the corresponding arylaminofumarates and primary alkylamines.