Torosyan, S. A. et al. published their research in Russian Journal of Organic Chemistry in 2018 | CAS: 82782-85-2

Methyl 4H-thieno[3,2-b]pyrrole-5-carboxylate (cas: 82782-85-2) belongs to thiazole derivatives. Thiazole is a five-membered, unsaturated, planar, 蟺-excessive heteroaromatic containing one sulfur atom and one pyridine-type nitrogen atom at position 3 of the cyclic ring system. The pyridine-type nitrogen in the thiazole ring deactivates the ring for electrophilic substitution reactions, which is further reduced in acid due to protonation of the thiazole ring.Formula: C8H7NO2S

Synthesis of N-Substituted Methyl 4H-Thieno[3,2-b]pyrrole-5-carboxylates was written by Torosyan, S. A.;Gimalova, F. A.;Zagitov, V. V.;Erastov, A. S.;Miftakhov, M. S.. And the article was included in Russian Journal of Organic Chemistry in 2018.Formula: C8H7NO2S This article mentions the following:

The alkylation of Me 4H-thieno[3,2-b]pyrrole-5-carboxylate with Me iodide and allyl, propargyl and benzyl bromides in the presence of sodium hydride in THF afforded the corresponding N-substituted derivatives I (R = Me, CH2=CHCH2, CH鈮CH2, Bn). Some reactions of the alkylation products were studied. In the experiment, the researchers used many compounds, for example, Methyl 4H-thieno[3,2-b]pyrrole-5-carboxylate (cas: 82782-85-2Formula: C8H7NO2S).

Methyl 4H-thieno[3,2-b]pyrrole-5-carboxylate (cas: 82782-85-2) belongs to thiazole derivatives. Thiazole is a five-membered, unsaturated, planar, 蟺-excessive heteroaromatic containing one sulfur atom and one pyridine-type nitrogen atom at position 3 of the cyclic ring system. The pyridine-type nitrogen in the thiazole ring deactivates the ring for electrophilic substitution reactions, which is further reduced in acid due to protonation of the thiazole ring.Formula: C8H7NO2S

Referemce:
Thiazole | C3H3NS – PubChem,
Thiazole | chemical compound | Britannica