Versatile Friedel-Crafts-Type Alkylation of Benzene Derivatives Using a Molybdenum Complex/ortho-Chloranil Catalytic System
作者:Yoshihiko Yamamoto、Kouhei Itonaga
DOI:10.1002/chem.200801105
日期:——
molybdenum complexes catalyze Friedel-Crafts-type alkylation reactions of benzene derivatives with alkenes and alcohols in the presence of an organic oxidant, o-chloranil. The utilization of [Mo(CO)(6)] and two equivalents of o-chloranil catalytically furnished the hydroarylation product of norbornene with p-xylene at 80 degrees C, whereas [Cr(CO)(6)] and [W(CO)(6)] failed to catalyze the same reaction, thus
Reactions of (arene)tricarbonylchromium stabilized carbocations with aromatics and β-dicarbonyl compounds
作者:Motokazu Uemura、Tatsuya Minami、Yuji Hayashi
DOI:10.1016/0022-328x(86)84039-6
日期:1986.1
Primary and secondary benzylic carbocations, stabilized by a tricarbonyl-chromium group, gave coupling products with several aromatics or β-dicarbonyl compounds in good yield and this reaction presents a new synthetic method for carbon-carbonbondformation. The chromium complexes of tertiary benzyl alcohols gave dehydrated products without carbon-carbon coupling products under similar conditions.
Room Temperature Catalyst System for the Hydroarylation of Olefins
作者:Siu Yin Lee、Alexander Villani-Gale、Chad C. Eichman
DOI:10.1021/acs.orglett.6b02492
日期:2016.10.7
A simple protocol for the hydroarylation of olefins to yield diarylmethine products is described. A Friedel–Crafts-type synthetic strategy allows direct access to biorelevant products in high atom efficiency. A combination of substoichiometric amounts of TMSCl and ZnBr2 promotes a rapid hydroarylation process at ambient temperature. The method is high yielding and is amenable to scale-up protocols
One catalyst fits all! One catalyst is active for a wide set of benzylating reactions (see scheme). A tandem process allows the use of aldehydes and ketones as benzylating agents.
Highly efficient iodine-catalyzed hydroarylation of arenes with styrenes
作者:Cheng-Ming Chu、Wan-Ju Huang、Ju-Tsung Liu、Ching-Fa Yao
DOI:10.1016/j.tetlet.2007.07.178
日期:2007.9
Iodine mediates the hydroarylation of styrenes with arenes and heteroarenes to afford 1,1-diarylalkanes in good to high yields. Details regarding the substrate scope and selectivity of this hydroarylation reaction are discussed.