Nucleophilic attack of thiols on phenylacetylene (1) in liquidammonia at room temperature gave the corresponding Z-isomer of styryl sulfides in high yield stereoselectively. Reaction of 1 with Na2S also proceeded selectively to give Z,Z-distyryl sulfide (12). On the other hand, reaction with NaSH gave 12 besides E,Z-isomer as a minor product.
Arylacetylenes react with sodium sulfide in the presence of water to yield divinylsulfides. The reaction proceeds in good to excellent yield for both electron-neutral and electron-deficient aromatic systems; for electron-rich aryls, longer reaction times are necessary. The sulfides represent useful substrates for further transformations, for example, oxidation to the corresponding divinylsulfoxides and divinylsulfones. Three selected divinylsulfide derivatives were oxidized selectively to the corresponding sulfoxides or sulfones.
Palladium-Catalyzed Carbonylative Four-Component Synthesis of Thiochromenones: The Advantages of a Reagent Capsule
作者:Chaoren Shen、Anke Spannenberg、Xiao-Feng Wu
DOI:10.1002/anie.201600953
日期:2016.4.11
reactions, especially those involving four or even more reagents, have been a long‐standing challenge because of the issues associated with balancing reactivity, selectivity, and compatibility. Herein, we demonstrate how the use of a reagent capsule provides straightforward access to synthetically valuable thiochromenone derivatives by a palladium‐catalyzed carbonylative four‐component reaction. To the
Convenient Horner-Wittig-based synthetic approaches to the preparation of (diphenylphosphinoyl)methyl vinyl sulfides as well as symmetrically and unsymmetrically substituted divinyl sulfides, are described. The syntheses involve the use of the easily available bis[(diphenylphosphinoyl)methyl] sulfide as a common starting material and sodium hydride as base, in tetrahydrofuran. sulfur - Wittig reaction
Reaktionen von 1,4-Pentadien-3-onen, 17. Mitt. Darstellung substituierter Thianderivate durch doppelte Additionen
作者:Hiroko Yamamura、Hans-Hartwig Otto
DOI:10.1002/ardp.19783110909
日期:——
entsprechenden Sulfone mit CH2-aciden Verbindungen umsetzen. Erst die zusatzliche Aktivierung der Doppelbindungen durch Estergruppen ermoglicht auch hier die Synthese entsprechender Thianderivate, deren Darstellung und stereochemische Eigenschaften beschrieben werden. Reactions of Pentadienones, XVII: - Synthesis of Substituted Thiane Derivatives by Double Addition Reactions Distyryl sulfides and sulfoxides