Sulfone Group as a Versatile and Removable Directing Group for Asymmetric Transfer Hydrogenation of Ketones
作者:Vijyesh K. Vyas、Guy J. Clarkson、Martin Wills
DOI:10.1002/anie.202004658
日期:2020.8.17
The sulfone functional group has a strong capacity to direct the asymmetrictransferhydrogenation (ATH) of ketones in the presence of [(arene)Ru(TsDPEN)H] complexes by adopting a position distal to the η6‐arene ring. This preference provides a means for the prediction of the sense of asymmetric reduction. The sulfone group also facilitates the formation of a range of reduction substrates, and its
Efficient preparation of trisubstituted alkenes using the SmI2 modification of the Julia–Lythgoe olefination of ketones and aldehydes
作者:István E Markó、Fiona Murphy、Lucien Kumps、Ali Ates、Roland Touillaux、Donald Craig、Santiago Carballares、Simon Dolan
DOI:10.1016/s0040-4020(01)00079-5
日期:2001.3
High yields of di- and tri-substituted alkenes are obtained by a modification of the Julia–Lythgoeolefination reaction involving the in situ capture of intermediate β-alkoxy-sulfones by benzoyl or trimethylsilyl chloride, followed by SmI2-mediated reductiveelimination. This novel protocol also provides a connective preparation of dienyl ethers, which are important partners in Diels–Alder cycloadditions
Heterocyclic synthesis by CC bond formation. Tetrahydrofuran and tetrahydropyran synthesis via oxonium ion-mediated cyclisation reactions
作者:Donald Craig、N.Paul King、Antony N. Shaw
DOI:10.1016/s0040-4039(97)10294-5
日期:1997.12
Dimethyl(methylthio)sulfonium tetrafluoroborate triggers ionisation and cyclisation of hemithioacetals 3 to give tetrahydrofurans 8–11 in good yields and stereoselectivities. The homologous sulfone analogues 17 give tetrahydropyrans on treatment with ethylaluminium dichloride.
Sulphone-mediated cyclobutanone to α-alkoxy-cyclopentanone ring expansion reactions; scope, limitations and applications
作者:Harry Finch、Adnan M.M. Mjalli、John G. Montana、Stanley M. Roberts、Richard J.K. Taylor
DOI:10.1016/s0040-4020(01)85603-9
日期:1990.1
treated with the lithiated sulphone (4) to give the ring expanded α-methoxyketones (12), (14) and (16) generally as a mixture of epimers. The same bicycloalkanones furnished the α-benzyloxyketones (13), (15), and (17) on reaction with reagent (5). The ketone (3) reacted with the sulphone anion (6) to give, after Lewis acid treatment, the α-allyloxycyclopentanone derivatives (27a) and (27b) and one of
The invention relates to inhibitors of Sphingosine Kinase enzymatic activity, and methods of treating diseases and disorders by administering inhibitors of Sphingosine Kinase enzymatic activity.