NHC–AuCl/Selectfluor: A Highly Efficient Catalytic System for Carbene-Transfer Reactions
摘要:
The combination of NHC-gold complex and Selectfluor has been found to be a highly efficient catalyst system for carbene-transfer reactions, with a turnover number (TON) up to 990000 and a turnover frequency (TOF) up to 82500 h(-1).
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.
Zinc-Catalyzed Functionalization of SiH Bonds with 2-Furyl Carbenoids through Three-Component Coupling
作者:Sergio Mata、Luis A. López、Rubén Vicente
DOI:10.1002/chem.201501155
日期:2015.6.15
A three‐component coupling of alk‐2‐ynals, 1,3‐dicarbonyls and silanes is reported. ZnCl2 serves as an inexpensive and low‐toxic catalyst for the overall transformation, which involves Knoevenagel condensation, cyclization, and carbene SiH bond insertion. The process takes place with high atom economy in the absence of organic solvents and shows a broad scope. This reaction is also applicable to the
Catching Elusive 2-Furyl Carbenes with Silanes: A Metal-Free Microwave-Assisted Silicon-Hydrogen Bond Functionalization
作者:Silvia González-Pelayo、Luis A. López
DOI:10.1002/adsc.201601037
日期:2016.12.22
An efficient, metal‐free, silicon–hydrogen bond functionalization based on the microwave‐assisted reaction of readily available enynones and silanes is reported. This process seemingly proceeds through a 2‐furyl carbene species, a particularly elusive intermediate. Preliminary studies on the metal‐free oxygen–hydrogen and nitrogen–hydrogen bond functionalization of representative alcohols, azoles and
method for preparing chiral organosilicons; however, all the carbene precursors used to date in this reaction have been diazo compounds, which significantly limits the structural diversity of the resulting chiral organosilicons. Herein, we report a protocol for rhodium-catalyzed asymmetric Si–H bond insertion reactions that use functionalized alkynes as carbene precursors. With chiral dirhodium tetracarboxylates