A Mild, Convenient, and Inexpensive Procedure for Conversion of Vinyl Halides to α-Haloketones
作者:Michael P. VanBrunt、Reuben O. Ambenge、Steven M. Weinreb
DOI:10.1021/jo020739m
日期:2003.4.1
to the corresponding alpha-chloroketone. Similarly, if a vinyl bromide is exposed to sodium hypobromite (freshly prepared from bromine and sodium hydroxide) at 0 degrees C in 2:5 acetic acid/acetone as solvent, an alpha-bromoketone is produced. This methodology has been applied to a number of vinyl chlorides and vinyl bromides, and the transformations generally proceed in high yields. The mild reaction
Expanding the Scope of the Gold(I)-Catalyzed Rautenstrauch Rearrangement: Protic Additives
作者:Cédric Bürki、Andrew Whyte、Sebastian Arndt、A. Stephen K. Hashmi、Mark Lautens
DOI:10.1021/acs.orglett.6b02505
日期:2016.10.7
The synthesis of substituted 2-cyclopentenones using a commercially available gold(I) catalyst is described under flexible reaction conditions. During the course of our investigations, we discovered that using a proton source as an additive is required to obtain the desired substituted cyclopentenones in good yields.
Ring Expansion, Ring Contraction, and Annulation Reactions of Allylic Phosphonates under Oxidative Cleavage Conditions
作者:Dupre Orr、Nikolas Yousefi、Thomas G. Minehan
DOI:10.1021/acs.orglett.8b00791
日期:2018.5.18
followed by treatment with base affords 2-cyclopenten-1-ones 7 in good overall yields. This method may offer a practical alternative to existing methods for effecting one-carbon ringexpansion, ring contraction, and annulation reactions.
Synthesis of Substituted Hydrindanes. Part I. Products Arising from the Cyclization of Acetonyl Cyclohexanones and Acetonyl Cyclohexadiones
作者:André Beth、Jacques Pelletier、Robert Russo、Marcel Soucy、Robert H. Burnell
DOI:10.1139/v75-209
日期:1975.5.15
The preparation and cyclizations of certain 1,4-diketones have been studied as a route to substituted hydrindan-2-one systems. Other types of products encountered are also described.
Mn(III)-promoted annulation of enol ethers and esters to fused or spiro 2-cyclopentenones
作者:E.J. Corey、Arun K. Ghosh
DOI:10.1016/s0040-4039(00)95679-x
日期:1987.1
Manganese(III)-promoted addition of various 1,3-dicarbonyl compounds to enol ethers or terminal enolesters, followed by hydrolysis of the resulting adducts and base catalyzed aldol cyclization provides an effective process for the synthesis of a wide range of fused and spiro 2-cyclopentenones.