Zn(II)- or Ag(I)-Catalyzed 1,4-Metathesis Reactions between 3-En-1-ynamides and Nitrosoarenes
作者:Sagar Ashok Gawade、Deepak B. Huple、Rai-Shung Liu
DOI:10.1021/ja412634w
日期:2014.2.26
Catalyst-dependent metathesis reactions between 3-en-1-ynamides and nitrosoarenes are described. Particularly notable are the unprecedented 1,4-metathesis reactions catalyzed by Ag(I) or Zn(II) to give 2-propynimidamides and benzaldehyde derivatives. With 3-en-1-ynamides bearing a cycloalkenyl group, 1,4-oxoimination products were produced efficiently. We have developed metathesis/alkynation cascades for unsubstituted 2-propynimidamides and benzaldehyde species generated in situ, to manifest 1,4-hydroxyimination reactions of 3-en-1-ynes. Both 1,4-oxoiminations and 1,4-hydroxyiminations increase the molecular complexity of products.
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 Selectfluoroxidation. The presence of pyridine alters the reaction chemoselectivity to give 4‐hydroxy‐2‐en‐1‐carbonyl products instead. A cooperative action of