Electrophilic heterocyclization of unsaturated amino compounds in the synthesis of nitrogen-containing heterocycles (review)

Chemistry of heterocyclic compounds at the Institute of Organic Chemistry, National Academy of Sciences of Ukraine (Review)

“…As a result of investigations it was established that the reactions of derivatives of 2-allyl-, 2-cinnamyl-, and 2-propargylthienopyrimidine, which take place with the participation of electrophiles, can be directed toward the formation of angular (by the action of iodine, bromine, selenium dioxide, and haloid acids) or linear (by the action of concentrated sulfuric acid) derivatives of thiazolino-, trihydrothiazino-, thiazolo-, and dihydroselenothiazinothienopyrimidine [138].…”

“…A new reaction was discovered for the oxidation-reduction heterocyclization of acetylenes by the action of chalcogen dioxides and hydrogen halides, during which sulfur-and selenium-containing heterocyclic compounds are formed [138,[153][154][155] …”