In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Enantioselective Michael addition of ketones to maleimides catalyzed by bifunctional monosulfonyl DPEN salt, published in 2010-07-07, which mentions a compound: 4144-22-3, Name is 1-(tert-Butyl)-1H-pyrrole-2,5-dione, Molecular C8H11NO2, Application In Synthesis of 1-(tert-Butyl)-1H-pyrrole-2,5-dione.
An unprecedented enantioselective Michael addition of various ketones to maleimides catalyzed by a simple bifunctional primary amine, monosulfonyl DPEN salt, is reported. The reaction provides the desired pyrrolidine diones, e.g., I in good to excellent yields (up to 99%) with excellent enantioselectivities (up to 99%).
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Reference:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics