Nickel-Catalyzed Sonogashira Reactions of Non-activated Secondary Alkyl Bromides and Iodides
作者:Jun Yi、Xi Lu、Yan-Yan Sun、Bin Xiao、Lei Liu
DOI:10.1002/anie.201307069
日期:2013.11.18
A nicked reaction: The title reaction of terminal alkynes with non‐activated secondaryalkyliodides and bromides was accomplished for the first time. This reaction provides a new and practical approach for the synthesis of substituted alkynes (see scheme; cod=cyclo‐1,5‐octadiene).
A copper‐catalyzedreductivecross‐coupling reaction of nonactivated alkyl tosylates and mesylates with alkyl and arylbromides was developed. It provides a practical method for efficient and cost‐effective construction of aryl–alkyl and alkyl–alkyl CC bonds with stereocontrol from readily available substrates. When used in an intramolecular fashion, the reaction enables convenient access to various
polyhydroxylated azepanes. Polyheterocyclic scaffolds were prepared by intramolecular aza-[4+3] cycloadditionreactions of aza-oxyallylic cations with cyclic dienes. The aza-oxyallylic cation was generated in situ by the dehydrohalogenation of α-halohydroxamates. The highly functionalized heterocyclic products undergo a variety of reactions that provide useful scaffolds for target-directed synthesis, including
2,9-dioxabicyclo[4.2.1]Nonan - darstellung, massenspektroskopie und umlagerung eines neuen heterocyclischen systems
作者:Wittko Francke、Wolfgang Reith
DOI:10.1016/s0040-4039(01)92897-7
日期:1981.1
Nine different methyl-substituted compounds of a new acetal system 5 are synthesized from 4-(5-methyl-2-furyl)alkanoles 1 and are rearranged to ketones 6; mass spectroscopic fragmentation patterns are described.
The effect of side chain substituents on the intramolecular diels-alder reaction of the furan diene: the synthesis of (±)-1,4-epoxycadinane
作者:Christine Rogers、Brian A. Keay
DOI:10.1016/s0040-4039(00)99462-0
日期:1989.1
The effect of sidechain substituents on the IntramolecularDiels-Alderreaction of the Furan diene (IMDAF) is reported in which the sidechain connecting the furan diene to the dienophile contain four carbon atoms. The synthesis of 1,4-epoxycadinane utilizing this methodology is described.