Zinc-Catalyzed Synthesis of Conjugated Dienoates through Unusual Cross-Couplings of Zinc Carbenes with Diazo Compounds
作者:Sergio Mata、María J. González、Jesús González、Luis A. López、Rubén Vicente
DOI:10.1002/chem.201604194
日期:2017.1.23
of two carbene sources, such as vinyl diazocompounds and enynones, enabled the synthesis of conjugated dienoate derivatives. This reaction involved the unprecedented coupling of a zinc furyl carbene with vinyl diazocompoundsthrough the γ‐carbon. Alternatively, dienoates were also prepared by a commutative cross‐coupling of zinc vinyl carbenes generated from cyclopropenes and simple diazo compounds
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