In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Synthesis of cyanopyrroles, published in 1999-01-31, which mentions a compound: 2199-44-2, mainly applied to cyanopyrrole preparation; pyrrolenitrile preparation; oximinocyanoacetate diketone Knorr reductive condensation, Name: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate.
Regioselective synthesis of α-cyanopyrroles (vs. α-alkoxycarbonylpyrroles) using oximinocyanoacetate esters in a Knorr-type reductive condensation with β-diketones can be directed by the presence of water. Thus, HON:C(CN)CO2Me was reacted with CH2Ac2 in hot AcOH in the presence of Zn dust to give exclusively 3,5-dimethylpyrrole-2-carbonitrile when the AcOH was wet. Whereas, in glacial AcOH, only Me 3,5-dimethylpyrrole-2-carboxylate was isolated in ∼40% yield.
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com