Silver-catalyzed activation of internal propargylic alcohols in supercritical carbon dioxide: efficient and eco-friendly synthesis of 4-alkylidene-1,3-oxazolidin-2-ones
作者:Huan-Feng Jiang、Jin-Wu Zhao
DOI:10.1016/j.tetlet.2008.10.078
日期:2009.1
The silver-catalyzed cycloaddition reactions of carbondioxide with internal propargylicalcohols and primary amines under supercritical conditions give 4-alkylene-1,3-oxazolidin-2-ones in good to excellent yields. The optimized conditions are to use an alcohol (2 mmol), an amine (2 mmol), silver acetate (0.1 mmol), and carbondioxide (8 MPa) at 120 °C.
ne, copper iodide could efficiently catalyze the coupling of internal propargylicalcohols with carbondioxide to afford the corresponding α‐alkylidene cyclic carbonates in moderate to excellent yields. Moreover, we have developed a new and versatile protocol for the chemo‐ and stereoselective synthesis of a wide range of (E)‐α‐iodoalkylidene cyclic carbonates from carbondioxide, propargylic alcohols
Carbon Dioxide Triggered and Copper-Catalyzed Domino Reaction: Efficient Construction of Highly Substituted 3(2<i>H</i>)-Furanones from Nitriles and Propargylic Alcohols
A novel carbon dioxide triggered and copper-catalyzed domino reaction for the efficient synthesis of highlysubstituted 3(2H)-furanones from readily available nitriles and propargylic alcohols has been developed. Carbon dioxide is a prerequisite for achieving the present catalytic transformation, and one of the oxygen atoms of carbon dioxide is incorporated into the 3(2H)-furanones. Nitriles not only
[(NHC)AuCl]-catalyzed Meyer–Schuster rearrangement: scope and limitations
作者:Rubén S. Ramón、Nicolas Marion、Steven P. Nolan
DOI:10.1016/j.tet.2008.10.111
日期:2009.2
system allowing for the synthesis of a variety of α,β-unsaturated ketones has been developed. [(NHC)AuCl] (NHCN-heterocyclic carbene) in the presence of a silver(I) salt was found to catalyze the Meyer–Schuster rearrangement, leading to α,β-unsaturated ketones from easily accessible propargylic alcohols in high yields. Catalysis was performed in a 2:1 mixture of methanol and water at 60 °C and afforded