Oxovanadium(V)-Induced Cross-Coupling Reaction between Two Ligands of Organozinc Compounds
作者:Toshikazu Hirao、Takashi Takada、Akiya Ogawa
DOI:10.1021/jo9919106
日期:2000.3.1
Oxovanadium(V) compounds such as VO(OEt)Cl(2) serve as useful oxidants for organozinc compounds, providing the corresponding cross-coupling products derived from two ligands of organozinc compounds. In particular, triorganozincates undergo selective cross-coupling smoothly by the action of oxovanadium(V).
Synthesis of 4-Alkylidene-Substituted 1,2,3,4-Tetrahydroisoquinolines via Palladium-Catalyzed Carbopalladation/C–H Activation of 2-Bromobenzyl-N-propargylamines
synthesized via the formation of a cyclic carbopalladation complex followed by C–H bond activation of the sp2 carbon in arenes. This domino reaction proceeds with good selectivity and provides good yields of the products. The requisite starting materials are synthesized by copper(I) iodide catalyzed A3-coupling reactions. Tetrasubstituted alkene-based 1,2,3,4-tetrahydroisoquinolines are synthesized via the
Reactivity of 5‐(Alkynyl)dibenzothiophenium Salts: Synthesis of Diynes, Vinyl Sulfones, and Phenanthrenes
作者:Kevin Kafuta、Christian J. Rugen、Tobias Heilmann、Tianshu Liu、Christopher Golz、Manuel Alcarazo
DOI:10.1002/ejoc.202100323
日期:2021.8.6
to their reactivity as electrophilic alkynylation reagents, they undergo regioselective additions to the C−C triple bond. The products thus obtained can be used for the synthesis of Z-vinyl sulfones and 9,10-substituted phenanthrenes.
Copper-Catalyzed Ring Opening of [1.1.1]Propellane with Alkynes: Synthesis of Exocyclic Allenic Cyclobutanes
作者:Dániel Lasányi、Gergely L. Tolnai
DOI:10.1021/acs.orglett.9b03999
日期:2019.12.20
Despite the long history and interesting properties of propellanes, these compounds still have tremendous potential to be exploited in synthetic organic chemistry. Herein we disclose an experimentally simple procedure to achieve cyclobutane-containing allenes and alkynes through a copper-catalyzed ring opening of [1.1.1]propellane and subsequent reaction with ethynes.
Alkynes as Linchpins for the Additive Annulation of Biphenyls: Convergent Construction of Functionalized Fused Helicenes
作者:Rana K. Mohamed、Sayantan Mondal、Joseph V. Guerrera、Teresa M. Eaton、Thomas E. Albrecht‐Schmitt、Michael Shatruk、Igor V. Alabugin
DOI:10.1002/anie.201606330
日期:2016.9.19
A new approach to fused helicenes is reported, where varied substituents are readily incorporated in the extended aromatic frame. From the alkynyl precursor, the final helical compounds are obtained under mild conditions in a two‐step process, in which the final C−C bond is formed via a photochemical cyclization/ dehydroiodination sequence. The distortion of the π‐system from planarity leads to unusual