Facile Synthesis of CarboxylicAnhydrides Using 4,5-Dichloro-2-[(4-nitrophenyl)sulfonyl]pyridazin-3(2<i>H</i>)-one
作者:Yong-Jin Yoon、Jeum-Jong Kim、Yong-Dae Park、Woo Song Lee、Su-Dong Cho
DOI:10.1055/s-2003-40512
日期:——
A novel and facile synthesis of carboxylic anhydrides from carboxylicacidusing 4,5-dichloro-2-[(4-nitrophenyl)sulfonyl[pyridazin-3(2H)-one (2) is presented. Treatment of aliphatic or aromaticcarboxylicacids with 2 in the presence of base in organic solvents gave the corresponding anhydrides in good or excellent yields.
A conversion of o-phenylenediamines into benzotriazoles was achieved at room temperature using tert-butyl nitrite. The optimized conditions are also well suited for the transformation of sulfonyl and acyl hydrazines into corresponding azides. This protocol does not require any catalyst or acidic medium. The desired products were obtained in excellent yields in a short span of time.