Scope and limitation of intramolecular Pauson–Khand reaction of fluorine-containing enynes
摘要:
Intramolecular Pauson-Khand reaction of various fluorine-containing enynes was investigated under various conditions. The reaction of the substrates. which have fluorine atom(s) or fluorine-containing group(s) attached to alkenyl moiety, gave the corresponding cyclopentenones in low to moderate yield, while that of the substrates bearing fluorine-containing groups attached to alkynyl moiety afforded the corresponding cyclopentenones in low to high yield. (C) 2001 Elsevier Science B.V. All rights reserved.
Catalytic Generation of Zinc Carbenes from Alkynes: Zinc-Catalyzed Cyclopropanation and SiH Bond Insertion Reactions
作者:Rubén Vicente、Jesús González、Lorena Riesgo、Javier González、Luis A. López
DOI:10.1002/anie.201203914
日期:2012.8.6
Think zinc: Synthetically relevant zinc(II) carbenes are catalytically generated fromalkynes (see scheme). This new approach allows zinc‐catalyzed cyclopropanation and SiHbondinsertionreactions to generate the corresponding cyclopropylfurans or silane derivatives. The structure of the key carbene intermediate was studied using theoretical methods.