Metal-Catalyzed Synthesis of Functionalized 1,2,4-Oxadiazoles from Silyl Nitronates and Nitriles
作者:Paul Nikodemiak、Ulrich Koert
DOI:10.1002/adsc.201601378
日期:2017.5.17
to 1,2,4‐oxadiazoles is described. Silver(I) triflate (AgOTf) and and ytterbium(III) triflate [Yb(OTf)3] are suitable catalysts. A variety of functional groups is tolerated in the nitrile. The reaction works well for alkenyl and aryl silyl nitronates while the use of alkyl silyl nitronates is less efficient. Mechanistic studies are in favour of an elimination of tert‐butyl(dimethyl)silanol (TBSOH) after
描述了金属催化的甲硅烷基磺酸盐和腈的环加成反应,生成1,2,4-恶二唑。三氟甲磺酸银(I)(AgOTf)和三氟甲磺酸(III)[Yb(OTf)3 ]是合适的催化剂。腈中可耐受多种官能团。该反应对于烯基和芳基甲硅烷基硝酸盐效果很好,而烷基甲硅烷基硝酸盐的使用效率较低。机理研究支持在环加成步骤后消除叔丁基(二甲基)硅烷醇(TBSOH)。该新方法也已经被用于药物紫杉醇的合成。