Electrophilic Cyclization of Buta-1,3-diynylarenes: Synthesis of Precursors of (Z)-3-Ene-1,5-diyne Systems Fused to Heterocycles
作者:Stefan Bräse、Irina Balova、Natalia Danilkina
DOI:10.1055/s-0030-1259547
日期:2011.3
simple, convenient, and promising strategy for the synthesis of 2-ethynyl-3-iodo-benzothiophenes, -benzofurans, and -indoles based on electrophilic cyclization of easily available ortho- functionalized (buta-1,3-diynyl)arenes was developed. The unique potential of using these compounds as starting materials for the syn- thesis of enediyne systems, containing thiophene, furan, and pyrrole units is demonstrated
Polyynes to Polycycles: Domino Reactions Forming Polyfused Chalcogenophenes
作者:Annaliese S. Dillon、Bernard L. Flynn
DOI:10.1021/acs.orglett.0c00733
日期:2020.4.17
Polyfused chalcogenophenes are prepared in one step through polyelectrophilic cyclization of polyynes using the ambiphilic reagent MeACl (A = S, Se, or Te). Up to four new rings have been generated under mild conditions, including thiophenes, selenophenes, and tellurophenes.