Nature of the Nucleophilic Oxygenation Reagent Is Key to Acid-Free Gold-Catalyzed Conversion of Terminal and Internal Alkynes to 1,2-Dicarbonyls
作者:Alexey Yu. Dubovtsev、Nikolay V. Shcherbakov、Dmitry V. Dar’in、Vadim Yu. Kukushkin
DOI:10.1021/acs.joc.9b02785
日期:2020.1.17
2,3-Dichloropyridine N-oxide, a novel oxygen transfer reagent, allows the conductance of the gold(I)-catalyzed oxidation of alkynes to 1,2-dicarbonyls in the absence of any acid additives and under mild conditions to furnish the target species, including those derivatized by highly acid-sensitive groups. The developed strategy is effective for a wide range of alkyne substrates such as terminal- and
2,3-二氯吡啶N-氧化物,一种新型的氧转移试剂,可在不存在任何酸添加剂且在温和条件下,将金(I)催化的炔烃氧化为1,2-二羰基的电导,以提供目标物种,包括那些由高度酸敏感性基团衍生的物种。所开发的策略可用于多种炔烃底物,例如末端和内部炔烃,乙酰胺,炔基醚/硫醚,甚至未取代的乙炔(40例;产率高达99%)。通过一锅杂环化成功地将氧化整合到捕获反应性二羰基化合物中,并整合到六元氮杂杂环的合成中。这种无酸合成路线也成功地用于天然1,2-二酮的全合成。