Category: thiazolidine. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: Ethyl 3,5-Dimethyl-2-pyrrolecarboxylate, is researched, Molecular C9H13NO2, CAS is 2199-44-2, about Sulfur derivatives in the pyrrole series. Author is Treibs, Alfred; Schulze, Lothar; Kreuzer, Franz Heinrich; Kolm, Hans Georg.
Reaction of 2,4-dimethyl-5-(ethoxycarbonyl)pyrrole (I) with SO2 in the presence of EtBr and AlCl3 or in CH2Cl2 containing AlCl3 gave the sulfide II or the sulfoxide III, resp. Successive reaction of SCl2 with MeOH and 2-methyl-3-(ethoxycarbonyl pyrrole gave the disulfide IV. Addition of EtSH to tris[2-methyl-3-(ethoxycarbonyl)-5-pyrrolyl]methane gave the sulfide V. Addition of p-tolysulfonyl isothiocyanate to I gave the derivative VI.
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com