The first controllable, regioselectiveradicalamination of allenes with N‐fluoroarylsulfonimide is described to proceed under very mild reaction conditions. With this methodology, a general and straightforward route for the synthesis of both allenamides and fluorinated tetrasubstitutedalkenes was realized from a wide range of terminal and internal allenes.
Allenes for Versatile Iron-Catalyzed C–H Activation by Weak O-Coordination: Mechanistic Insights by Kinetics, Intermediate Isolation, and Computation
作者:Antonis M. Messinis、Lars H. Finger、Lianrui Hu、Lutz Ackermann
DOI:10.1021/jacs.0c04837
日期:2020.7.29
ortho-regioselectivity in proximity to the weakly-coordinating carbonyl group for a range of substituted phenones and allenes. Detailed mechanistic studies, including the isolation of key intermediates, the structural characterization of an iron-metallacycle and kinetic analysis, allowed the sound elucidation of a plausible catalytic working mode. This mechanistic rationale is supported by detailed computational
Regio- and Stereoselective Synthesis of Multi-Alkylated Allylic Boronates through Three-Component Coupling Reactions between Allenes, Alkyl Halides, and a Diboron Reagent
作者:Yu Ozawa、Kohei Endo、Hajime Ito
DOI:10.1021/jacs.1c06538
日期:2021.9.1
valuable precursors for the rapid and stereoselective construction of densely substituted carbon skeletons. Herein, we report the first synthetic approach for differentially 2,3,3-trialkyl-substituted allylic boronates that contain a stereodefined tetrasubstituted alkene structure. Copper(I)-catalyzed regio- and stereoselectivethree-component coupling reactions between gem-dialkylallenes, alkyl halides
Bifurcated Nickel-Catalyzed Functionalizations: Heteroarene C−H Activation with Allenes
作者:Sachiyo Nakanowatari、Thomas Müller、João C. A. Oliveira、Lutz Ackermann
DOI:10.1002/anie.201709087
日期:2017.12.11
A unified strategy for nickel(0)‐catalyzed C−H allylations, alkenylations, and dienylations has been realized through versatile hydroarylations of allenes with ample scope. Thus, an inexpensive nickel catalyst modified with a N‐heterocyclic carbene ligand enabled the direct transformation of C−H bonds of biologically relevant imidazole and purine derivatives with full control of regio‐ and chemoselectivity
Ruthenium(II)‐Catalyzed CH Functionalizations with Allenes: Versatile Allenylations and Allylations
作者:Sachiyo Nakanowatari、Lutz Ackermann
DOI:10.1002/chem.201502785
日期:2015.11.2
Ruthenium(II)‐catalyzed direct CHfunctionalization of aromatic compounds with allenes was achieved under exceedingly mild reaction conditions to yield trisubstituted allenes. The reactions of N‐methoxybenzamides proceeded smoothly in an isohypsic fashion at ambient temperature with high chemo‐ and regioselectivity, thereby providing a versatile means of accessing trisubstituted allenes. Detailed