Aromatic Ring-Opening of 2-Fluorobenzothiophenes by Alkyllithiums
作者:Michel Belley、Zohra Douida、John Mancuso、Marc De Vleeschauwer
DOI:10.1055/s-2004-837230
日期:——
Diphenylacetylenes are obtained when alkyllithium reagents are added to 3-aryl-2-fluorobenzothiophenes at low temperature. The aromatic ring-opening mechanism involves a nucleophilic addition of the alkyllithium to the sulfur atom of the thiophene. The resulting 2,2-diaryl-1-fluorovinyl anion subsequently undergoes a Fritsch-Buttenburg-Wiechell rearrangement to afford the diphenylacetylene.