1,3-Dipolar cycloaddition reactions of isothiazol-3(2<i>H</i>)-ones with nitrile oxides. An unexpected site selectivity of the carbonyl bond of 5-benzoyl-isothiazol-3(2<i>H</i>)-one
作者:E. Coutouli-Argyropoulou、C. Anastasopoulos
DOI:10.1002/jhet.5570330335
日期:1996.5
2,6-Dichlorobenzonitrile oxide (2a) reacts with isothiazolones 1a and 1b at the ethylenic double bond to give 4 via transformation of the primary cycloadducts 3. Mesitonitrile oxide (2b) adds preferentially to the carbonyl double bond of 1b yielding the monoadduct 5 and the bisadduct 6.