Efficient synthesis of halo indanones via chlorosulfonic acid mediated Friedel–Crafts cyclization of aryl propionic acids and their use in alkylation reactions
作者:Anil K. Sharma、Amutha V. Subramani、Christopher B. Gorman
DOI:10.1016/j.tet.2006.10.065
日期:2007.1
of the electron-deficient arenes this chemistry is not efficient. Here it is reported that chlorosulfonic acid (used as solvent) is an efficient reagent for cyclization of electron-withdrawing arenes. These molecules are potentially useful for subsequent alkylation reactions. The selective alkylation of 5,7-dibromo indanone is demonstrated using Pd-catalyzed Grignard coupling to provide monoalkylated
Convenient Access to Polysubstituted 1-Indanones by Sc(OTf)<sub>3</sub>-Catalyzed Intramolecular Friedel−Crafts Acylation of Benzyl Meldrum's Acid Derivatives
作者:Eric Fillion、Dan Fishlock
DOI:10.1021/ol035817m
日期:2003.11.1
The intramolecular Friedel-Crafts acylation of benzyl Meldrum's acids is catalyzed by Sc(OTf)(3) under mild reaction conditions. Several polysubstituted 1-indanones have been prepared.
Meldrum's Acids as Acylating Agents in the Catalytic Intramolecular Friedel−Crafts Reaction
作者:Eric Fillion、Dan Fishlock、Ashraf Wilsily、Julie M. Goll
DOI:10.1021/jo0483724
日期:2005.2.1
dialkyl thioether, aryl methyl ether, aryl TIPS and TBDPS ethers, nitrile- and nitro-substituted aryls, alkyl and aryl halides) for a variety of 5-benzyl (enolizable Meldrum's acids) and 5-benzyl-5-substituted Meldrum's acids (quaternized Meldrum's acids), forming 1-indanones and 2-substituted-1-indanones, respectively, are delineated. This method was further applied to the synthesis of 1-tetralones,
Scandium triflate-catalyzed intramolecular Friedel–Crafts acylation with Meldrum's acids: insight into the mechanism
作者:Eric Fillion、Dan Fishlock
DOI:10.1016/j.tet.2009.05.058
日期:2009.8
Friedel–Crafts acylation of arenes with Meldrum'sacid derivatives catalyzed by Sc(OTf)3 was reported as a mild and general entry into functionalized 1-indanones. Mechanistic investigations were undertaken to determine the rate-determining step in the acylation sequence using Meldrum'sacid, as well as to examine the role of the Lewis acid catalyst. Enolizable Meldrum'sacid derivatives react via an acyl ketene