Green and Efficient: Iron-Catalyzed Selective Oxidation of Olefins to Carbonyls with O<sub>2</sub>
作者:Angela Gonzalez-de-Castro、Jianliang Xiao
DOI:10.1021/jacs.5b03956
日期:2015.7.1
A mild and operationally simple iron-catalyzed protocol for the selective aerobic oxidation of aromatic olefins to carbonyl compounds is described. Catalyzed by a Fe(III) species bearing a pyridine bisimidazoline ligand at 1 atm of O2, α- and β-substituted styrenes were cleaved to afford benzaldehydes and aromatic ketones generally in high yields with excellent chemoselectivity and very good functional
Tandem Claisen Rearrangement/6-<i>endo</i>Cyclization Approach to Allylated and Prenylated Chromones
作者:Bernd Schmidt、Martin Riemer、Uwe Schilde
DOI:10.1002/ejoc.201501151
日期:2015.12
o-acylphenols reacted upon microwave irradiation to form C-allylated or -prenylated chromone derivatives, depending on the substitution pattern of the arene and the allyl substituent. The reaction proceeds through a tandemClaisen rearrangement and 6-endo-trig or 6-endo-dig cyclization sequence. For prenyl ethers, the tandem sequence can be extended by a Cope rearrangement to furnish 6-prenylchromones.
Catalyst-Controlled Product Selectivity for Cycloaddition of Bis(indol-3-yl)-allenes to Fused Spiroindolines and Mechanistic Studies
作者:Yan-Yan Zhang、Yin Wei、Min Shi
DOI:10.1021/acs.orglett.9b02992
日期:2019.10.18
A catalyst-controlled cycloaddition reaction of bis(indol-3-yl)-allenes gives rise to two different types of fused spiroindolines bearing a spiro quaternary stereocenter, affording a range of fused spiroindolines in good yields. The asymmetric desymmetrization of bis(indol-3-yl)-allenes with very high regioselectivities and excellent enantioselectivities has been successfully established and catalyzed
Polymer supported synthesis of a natural product-inspired oxepane library
作者:Sudipta Basu、Herbert Waldmann
DOI:10.1016/j.bmc.2014.05.039
日期:2014.8
the natural product scaffolds. Their synthesis requires the development of novel strategies amenable to formats suitable for library build-up. We describe a method for the synthesis of an oxepane library inspired by the core structure of oxepane natural products endowed with multiple bioactivities. Core aspects of the strategy are the establishment of a one-pot method employing different immobilized
Synthesis of Amino-Substituted Indanes and Tetralins via Consecutive Multibond-Forming Tandem Processes
作者:Mark W. Grafton、Louis J. Farrugia、Andrew Sutherland
DOI:10.1021/jo401182r
日期:2013.7.19
approach for the synthesis of amino-substituted indanes and tetralins from readily available alkyne-derived allylic alcohols via consecutive multibond-forming tandem processes has been developed. In the first one-pottandem process, a series of cyclic dienes were prepared using an Overman rearrangement under thermal conditions, followed by a ruthenium(II)-catalyzed ring closing enyne metathesis reaction.