An efficient method for allylation of ketones with tetra-allylstannane
摘要:
A variety of ketones undergo an allylation reaction with tetra-allyltin in the presence of a catalytic amount of Cu(OTf), or Sn(OTf)(2). The method,vas found to be superior to most of the known methods, which are efficient only with aldehydes. (C) 2001 Elsevier Science Ltd. All rights reserved.
Rhodium-catalyzed redox allylation reactions of ketones
作者:Florence J. Williams、Robin E. Grote、Elizabeth R. Jarvo
DOI:10.1039/c1cc14691b
日期:——
Ketones react with allyl acetate to generate tertiary homoallylic alcohols in the presence of a rhodium catalyst and bis(pinacolato)diboron. A range of substrates, including aryl, alkyl and cyclic ketones react smoothly under these conditions. Diastereoselective allylation reactions of functionalized ketones such as pregnenolone acetate are also reported.
Diene-Ligated Iridium Catalyst for Allylation Reactions of Ketones and Imines
作者:Timothy J. Barker、Elizabeth R. Jarvo
DOI:10.1021/ol802598c
日期:2009.3.5
catalyst for allylation reactions of ketones using allylboronic ester. Mechanistic experiments are consistent with formation of a nucleophilic allyliridium(I) complex that is activated by the diene ligand toward attack of a ketone. Aryl and alkyl ketones react smoothly at room temperature. Aldimines also undergo allylation under these reaction conditions, requiring increased reaction times relative to the
Although the Lewis acid promoted allylation of ketones with allylstannanes gives the corresponding tert-homoallyl alcohols in lower yields in comparison with those of aldehydes, the use of Lewis acid-Lewis base combined catalysts such as Zn(OTf)(2)-2,6-lutidine and Zn(OTf)(2)-pyridine dramatically enhances the yield of the tert-alcohols. (C) 2000 Published by Elsevier Science Ltd.
An efficient method for allylation of ketones with tetra-allylstannane
作者:Rajesh M Kamble、Vinod K Singh
DOI:10.1016/s0040-4039(01)01606-9
日期:2001.10
A variety of ketones undergo an allylation reaction with tetra-allyltin in the presence of a catalytic amount of Cu(OTf), or Sn(OTf)(2). The method,vas found to be superior to most of the known methods, which are efficient only with aldehydes. (C) 2001 Elsevier Science Ltd. All rights reserved.
Cobalt-Catalyzed Intramolecular Silylperoxidation of Unsaturated Diisopropylsilyl Ethers
作者:Jonathan P. Oswald、K. A. Woerpel
DOI:10.1021/acs.joc.9b00642
日期:2019.6.21
A cobalt-catalyzed intramolecular silylperoxidation reaction was developed that allows for the conversion of unsaturated diisopropylsilyl ethers to 3-sila-1,2,4-trioxepanes. Reduction of the peroxide unit of the 3-sila-1,2,4-trioxepane yields six-membered ring diisopropylsilylene acetals.