Copper(II)-Catalyzed Reactions of α-Keto Thioesters with Azides via C–C and C–S Bond Cleavages: Synthesis of <i>N</i>-Acylureas and Amides
作者:Rajib Maity、Sandip Naskar、Indrajit Das
DOI:10.1021/acs.joc.7b03054
日期:2018.2.16
Cu(II)-catalyzed reaction of α-keto thioesters with trimethylsilyl azide (TMSN3) proceeds with the transformation of the thioester group into urea through C–C and C–S bond cleavages, constituting a practical and straightforward synthesis of N-acylureas. When diphenyl phosphoryl azide (DPPA) is used instead as the azide source in an aqueous environment, primary amides are formed via substitution of
Cu(II)催化α-酮硫代酸酯与三甲基硅烷基叠氮化物(TMSN 3)的反应是通过C-C和C-S键断裂将硫代酯基团转化为尿素,从而构成了一种实用而直接的N合成方法-酰基脲。当在水性环境中使用二苯基磷酰基叠氮化物(DPPA)作为叠氮化物来源时,伯酰胺是通过硫代酯基团的取代而形成的。建议反应通过最初形成的α-酮酰基叠氮化物的库尔修斯重排进行以产生酰基异氰酸酯中间体,其与额外量的叠氮化物或水进一步反应并重排以提供相应的产物。为了证明该方法的潜力,已经进行了一步合成的显示抗惊厥活性的吡咯乙脲和异戊脲。