The umpolung alkylation of silyl enol ethers with an iodonium(III) ylide proceeds under mild conditions to afford various 1,4-dicarbonyl compounds in high yields in the presence of a halogen-bonding catalyst. Unlike typical transition-metal activation processes of such ylideprecursors, which tend to proceed via carbenoid intermediates, experimental and computational studies indicate that halogen bonding
Cycloaddition of Arynes with Iodonium Ylides: a Mild and General Route for the Synthesis of Benzofuran Derivatives
作者:Xiao-Cheng Huang、Yi-Lin Liu、Yun Liang、Shao-Feng Pi、Feng Wang、Jin-Heng Li
DOI:10.1021/ol800051k
日期:2008.4.1
A mild and general cycloaddition of arynes with iodonium ylides protocol has been developed for the synthesis of benzofurans. In the presence of CsF, ortho-silyl aryltriflates were reacted with iodonium ylides smoothly at room temperature in moderate to good yields.
作者:Theodore A. Gazis、Bayan A. J. Mohajeri Thaker、Darren Willcox、Darren M. C. Ould、Jan Wenz、Jeremy M. Rawson、Michael S. Hill、Thomas Wirth、Rebecca L. Melen
DOI:10.1039/c9cc08749d
日期:——
Herein, we disclose the utilisation of iodonium ylides to access a range of boron dienolates. Heating of acyclic iodonium ylides in the presence of different aryl boranes leads to the formation of rare 1,3-carboboration products. This methodology could not be expanded to cyclic iodonium ylides which instead formed a Lewis acid-base adduct. Products proved to be remarkably stable under a wide range
Reactions of distabilized β-dicarbonyl sulfonium and iodonium ylides with isocyanates
作者:Yu. G. Gololobov、I. R. Golding、M. A. Galkina、B. V. Lokshin、I. A. Garbuzova、P. V. Petrovskii、Z. A. Starikova、B. B. Averkiev
DOI:10.1007/s11172-006-0347-3
日期:2006.5
The reactions of tosyl isocyanate with diethyl diphenylsulfuranylidenemalonate, 2-dimethylsulfuranylidenedimedone, and 2-dimethylsulfuranylideneindane-1,3-dione afforded 1,3-ditosyl-5,5-diethoxycarbonylimidazolidine-2,4-dione and tosylimination products at the keto groups, respectively. Phenyliodonium ylides derived from diethyl malonate and ethyl acetate react with 3,4-dichlorophenyl isocyanate to
The Synthesis of Polysubstituted Pyrroles<i>via</i>the Coupling of Phenyliodonium Ylides and Enamine Esters
作者:Jun-Yan Wang、Xian-Pei Wang、Zheng-Sen Yu、Wei Yu
DOI:10.1002/adsc.200900379
日期:2009.9
The boron trifluoride etherate (BF3⋅Et2O)-catalyzed reactions between phenyliodonium ylides and enamine esters provide an efficient method for the synthesis of polysubstituted pyrroles.