One-Pot Synthesis of Substituted Isothiazol-3(2<i>H</i>)-ones: Intramolecular Annulation of α-Carbamoyl Ketene-<i>S</i>,<i>S</i>-acetals via PIFA-Mediated N-S Bond Formation
作者:Dewen Dong、Jie Huang、Yumei Lu、Baofu Qiu、Yongjiu Liang、Nan Li
DOI:10.1055/s-2007-983875
日期:2007.9
A facile and efficient synthetic route towards; highly substituted isothiazol-3(2H)-ones 2 from readily available U.-carbamoyl ketene-S,S-acetals 1 is presented. The key step features the formation of an N-acylnitrenium ion, generated from the oxidization of substituted amides with the hypervalent iodine reagent phenyliodine(III) bis(trifluoroacetate) (PIFA), and its succeeding intramolecular amidation
一种简便有效的合成路线;介绍了来自容易获得的 U.-氨基甲酰基乙烯酮-S,S-缩醛 1 的高度取代的异噻唑-3(2H)-ones 2。关键步骤的特点是形成一个 N-酰基硝基离子,该离子由高价碘试剂苯碘(III)双(三氟乙酸)(PIFA)氧化取代的酰胺产生,然后其随后的分子内酰胺化形成一个新的 NS 键,从而提供标题化合物。