Nickel and palladiumcomplexes with the 1,1′-bis(diphenylphosphino)ferrocene ligand effectively catalyze regioselective cross-coupling of allylic ethers such as 1- or 3-methyl-2-propenyl silyl ethers with aryl-Grignard reagents, where the nickel catalyst leads to carbon—carbonbondformation at the more substituted position while carbon–carbon bondformation occurs at the less substituted position
Main Group-Catalyzed Cationic Claisen Rearrangements via Vinyl Carbocations
作者:Chloe G. Williams、Sepand K. Nistanaki、Krista Dong、Woojin Lee、Kendall N. Houk、Hosea M. Nelson
DOI:10.1021/acs.orglett.4c00837
日期:2024.6.14
interception of vinyl carbocations with allylethers. The reaction utilizes commercially available borate salts as catalysts and is effective at constructing sterically hindered C–C bonds. The reaction mechanism is studied experimentally and computationally to support a charge-accelerated [3,3] rearrangement of a silyloxonium cation. Our reaction is also applied to the highlystereoselectivesynthesis of fully
The catalytic Friedel–Crafts alkylation reaction of aromatic compounds with benzyl or allyl silyl ethers using Cl2Si(OTf)2 or Hf(OTf)4
作者:Isamu Shiina、Masahiko Suzuki
DOI:10.1016/s0040-4039(02)01376-x
日期:2002.9
The Friedel-Crafts alkylation reaction of various aromatic compounds with benzyl or allyl silyl ethers is effectively promoted under mild reaction conditions using Lewis acid catalysts. A mixture of the desired phenyltolylmethanes is obtained in 80% yield from toluene with benzyl dimethylsilyl or trimethylsilyl ether at 50degreesC in the presence of a catalytic amount of Cl2Si(OTf)(2) or Hf(OTf)(2). (C) 2002 Elsevier Science Ltd. All rights reserved.