Isothiazoles. Part VII. An efficient palladium-catalyzed functionalization of 3-amino-4-aryl-isothiazole 1,1-dioxides with organostannanes
作者:Francesca Clerici、Emanuela Erba、Maria Luisa Gelmi、Marinella Valle
DOI:10.1016/s0040-4020(97)10046-1
日期:1997.11
no-4-(4-methoxyphenyl)-isothiazole 1,1-dioxide (3) with a variety of vinyl-, aryl-, heteroaryl- and alkynylstannanes 4 provides a general and efficient method for the synthesis of 5-substituted isothiazole 1,1-dioxides 5. Different reaction conditions (catalyst, solvent, temperature) were tested for the coupling. The best results were obtained using toluene at reflux and benzylchlorobis(triphenylphosphine)palladium
5-溴-3-二乙基氨基-4-(4-甲氧基苯基)-异噻唑1,1-二氧化物(3)与各种乙烯基-,芳基-,杂芳基-和炔基炔烃4的钯催化反应提供了一般的合成5-取代异噻唑1,1-二氧化物5的有效方法。测试了不同的反应条件(催化剂,溶剂,温度)进行偶联。使用回流甲苯和苄基氯双(三苯基膦)钯作催化剂可获得最佳结果。当有机锡烷的反应性较低时,长时间加热会导致形成数量不等的还原产物3-二乙氨基-4-(4-甲氧基苯基)-异噻唑1,1-二氧化物(1)。