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 Improved synthesis of covalently strapped porphyrins. Application to highly deformed porphyrin synthesis, published in 1988-04-01, which mentions a compound: 2199-44-2, mainly applied to porphyrin strapped; polymethyleneporphyrin, Quality Control of Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate.
The title porphyrins I (n = 1, 2, 3) were prepared α,ω-Dicarboxyalkyl dichloride, was treated with 2 equiv of 2-(ethoxycarbonyl)-3,5-dimethylpyrrole, and the chain-linked bis[5-(ethoxycarbonyl)pyrrole] so obtained was transformed into the pyrrole-2-carboxaldehyde by using standard methodol. Protection of the formyl groups as the dicyanovinyl derivative and the activation of the 2-Me substituents with SO2Cl2 gave the bis[2-(chloromethyl)pyrrol)], which on reaction with a 5-unsubstituted 2-pyrrolecarboxylate, in warm AcOH, afforded the chain-linked dipyrromethane dimer in high yield. Regeneration of the formyl substituents and removal of the ester group produced the 5-formyldipyrromethane dimer II, which was cyclized intramolecularly, under high dilution, to give I. II (n = 0) failed to cyclize.
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com