Zn<sup>II</sup>- and Au<sup>I</sup>-Catalyzed Regioselective Hydrative Oxidations of 3-En-1-ynes with Selectfluor: Realization of 1,4-Dioxo and 1,4-Oxohydroxy Functionalizations
作者:Appaso Mahadev Jadhav、Sagar Ashok Gawade、Dhananjayan Vasu、Ramesh B. Dateer、Rai-Shung Liu
DOI:10.1002/chem.201304322
日期:2014.2.10
Catalytic 1,4‐dioxo functionalizations of 3‐en‐1‐ynes to (Z)‐ and (E)‐2‐en‐1,4‐dicarbonyl compounds are described. This regioselective difunctionalization was achieved in one‐pot operation through initial alkyne hydration followed by in situ Selectfluor oxidation. The presence of pyridine alters the reaction chemoselectivity to give 4‐hydroxy‐2‐en‐1‐carbonyl products instead. A cooperative action of
描述了3-烯-1-炔对(Z)-和(E)-2-烯-1,4-二羰基化合物的催化1,4-二氧羰基化作用。这种区域选择性的双功能化是通过最初的炔烃水合作用,然后进行原位Selectfluor氧化,通过一锅操作实现的。吡啶的存在会改变反应的化学选择性,从而产生4-羟基-2-en-1-羰基产物。吡啶和Zn II的协同作用有助于关键氧鎓中间体的水解。