Accessing Illusive <i>E</i> Isomers of α-Ester Hydrazones via Visible-Light-Induced Pd-Catalyzed Heck-Type Alkylation
作者:Nikita Kvasovs、Vladimir Gevorgyan
DOI:10.1021/acs.orglett.2c01409
日期:2022.6.17
been developed. This method operates via generation of a nucleophilic carbon-centered radical from alkyl bromide, iodide, or redox-active ester, followed by its addition to hydrazone, and a subsequent desaturation by palladium. The majority of products have E configuration, which are inaccessible by conventional condensation methods. In addition, a sequential C,N-alkylation protocol has been developed:
已经开发了可见光诱导的 Pd 催化的烷基化酯腙的立体选择性合成。该方法通过从烷基溴化物、碘化物或氧化还原活性酯中产生亲核碳中心基团,然后将其添加到腙中,随后用钯去饱和。大多数产品具有E构型,这是常规缩合方法无法达到的。此外,还开发了顺序 C,N-烷基化方案:1,3-二卤化物与乙醛酸衍生的腙之间的反应,产生四氢哒嗪。