Cobalt-Catalyzed C–H Activation and [3 + 2] Annulation with Allenes: Diastereoselective Synthesis of Indane Derivatives
作者:Arnab Dey、Chandra M. R. Volla
DOI:10.1021/acs.orglett.1c01521
日期:2021.7.2
ve [3 + 2] annulation reaction has been achieved, employing allenes as the annulation partners. The selective 2,3-migratory insertion of allenes with arylcobalt(III) species and the subsequent intramolecular diastereoselective nucleophilic addition of η1-allylcobalt onto the imine resulted in [3 + 2] annulation over the alternative [4 + 2] annulation. Furthermore, the oxidative annulation obviates
Silylium-Ion-Promoted Hydrosilylation of Aryl-Substituted Allenes: Interception by Cyclization of the Allyl-Cation Intermediate
作者:Supriya Rej、Hendrik F. T. Klare、Martin Oestreich
DOI:10.1021/acs.orglett.2c00011
日期:2022.2.18
hydrosilylation can be intercepted by an intramolecular electrophilic aromatic substitution or a Nazarov electrocyclization of an allyl-cation intermediate in the form of its endo isomer. By this, the selective formation of either the conventional 1,2-hydrosilylation product (vinylsilane) or a cyclized product (silylated indane) can be controlled.
Suzuki–Miyaura Cross Coupling Reactions of B-Allenyl-9-BBN
作者:Karin Radkowski、Günter Seidel、Alois Fürstner
DOI:10.1246/cl.2011.950
日期:2011.9.5
Despite the tremendously wide scope of the palladium-catalyzedSuzuki–Miyauracrosscoupling, boron-based allenylation reactions of aryl halides are virtually unknown. It is now demonstrated that t...
Photoredox-Catalyzed Chlorotrifluoromethylation of Arylallenes: Synthesis of a Trifluoromethyl Building Block
作者:Olga A. Storozhenko、Alexey A. Festa、Valeria A. Zolotareva、Victor B. Rybakov、Alexey V. Varlamov、Leonid G. Voskressensky
DOI:10.1021/acs.orglett.2c04214
日期:2023.1.20
A new class of trifluoromethyl building blocks─2-trifluoromethyl allyl chlorides─have been obtained through a photoredox-catalyzed chlorotrifluoromethylation of aryl allenes. The reaction proceeded in a regio- and stereoselective manner. A trifluoromethylated analog of the flunarizine drug was synthesized.
Palladium‐Catalyzed [6+2] Double Allene Annulation for Benzazocines Synthesis
作者:Haibo Xu、Shengming Ma
DOI:10.1002/anie.202213676
日期:2023.2
A palladium-catalyzed formal [6;2] annulation of allenyl benzoxazinanones with terminal allenes has been developed, forming the challenging 8-membered cycles. Decent yields and excellent regioselectivity have been observed undermildconditions with a remarkable Z-stereoselectivity for the exo-cyclic C=Cbonds.