Ligand-Effect in Gold(I)-Catalyzed Rautenstrauch Rearrangement: Regio- and Stereoselective Synthesis of Bicyclo[3.2.1]octa-3,6-dienes through Cyclodimerization of 1-Ethynyl-2-propenyl Esters
作者:Jidong Zhao、Shuang Yang、Xin Xie、Xiangdong Li、Yuanhong Liu
DOI:10.1021/acs.joc.7b02816
日期:2018.2.2
efficient and straightforward route to bicyclo[3.2.1]octa-3,6-dienes with high regio- and stereoselectivity. The formation of the [4 + 3] cycloadducts likely proceeds through the cycloaddition of a gold(I) carbenoid/gold-stabilized allyl cation intermediate with cyclopentadiene arising from Rautenstrauch rearrangement.
A stereoselective synthesis of ω-chlorodienals and ω-chlorodienones was described. Conjugated ω-chlorotrienals and trienones were also easily prepared via an efficient palladium-catalyzed rearrangement of allylic acetates.
作者:Roland U. Braun、Markus Ansorge、Thomas J. J. Müller
DOI:10.1002/chem.200600530
日期:2006.12.4
coupling of electron-deficient (hetero)aryl halides 1 and (hetero)aryl or alkenyl 1-propargyl alcohols 2 does not terminate at the stage of the expected internal propargyl alcohols, but rather gives rise to the formation of alpha,beta-unsaturated ketones 3 with a variety of acceptor substituents. This new domino reaction, a coupling-isomerization reaction (CIR), can be rationalized as a sequence of
A New Synthetic Approach to Phenol Derivatives: Use of Ring-Closing Olefin Metathesis
作者:Kazuhiro Yoshida、Tsuneo Imamoto
DOI:10.1021/ja050853x
日期:2005.8.1
Phenol derivatives, which are one of the most important classes of aromatic compounds in organic chemistry, were synthesized by ruthenium-catalyzed ring-closing olefin metathesis (RCM) of 1,4,7-trien-3-ones with versatile substitution patterns. The RCM reaction for producing phenol derivatives was also successful with 1,5,7-trien-3-one as another precursor. Most of the phenols prepared here could not
formal synthesis of (+)-pyrenolide D from (E)-crotonaldehyde is described. The key steps include an enantioselective Sharpless dihydroxylation of protected hex-4-en-1-yn-3-ol and a highly diastereoselective palladium-catalysed oxycarbonylation of (2R,3S,4S)-hex-5-ene-2,3,4-triol using iron pentacarbonyl as the carbon monoxide source. A concise, asymmetric formal synthesis of (+)-pyrenolide D from (E)-crotonaldehyde