In vinyl nucleophilic substitution (S(N)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.
Microwave-assisted DABCO-promoted regioselective [3 + 3] tandem cyclization: synthesis of pyrrolo[3,4-<i>b</i>]pyridine-4-ones from trifluoromethyl-alkynyl esters and α-aminomaleimide
DABCO-promoted strategy for the regioselective synthesis of pyrrolo[3,4-b]pyridine-4-one derivatives has been developed from the [3 + 3] annulation of α-aminomaleimide with substituted ethyl 2-butynoate. The characteristic features of this methodology include operational simplicity, high regioselectivity, metal-free reaction conditions, and short reaction times. The potential utility of these methods