P. Pouzet, I. Erdelmeier, P. Dansette
Dec 3, 1998
Citations
0
Influential Citations
13
Citations
Journal
Tetrahedron
Abstract
Abstract (4-Chlorophenyl)-(1-oxo-1λ4-benzo[b]thien-2-yl)methanone 2a was synthesized by oxidation of the corresponding benzo[b]thiophene derivative 2 with the oxidative system H 2 O 2 TFA . This benzo[b]thiophene sulfoxide undergoes Michael-type nucleophilic addition of sulfur- and oxygen-containing nucleophiles either under basic conditions leading to 2,3-dihydro-3-substituted-benzo[b]-thiophene 1-oxides or in acidic media leading then to rearomatized 3-substituted-benzo[b]thiophenes. This method provides an easy two-step functionalization of 2-acyl-benzo[b]thiophene derivatives.