strong reduction potentials. Under visiblelight irradiation, the phenolate anion enabled the reduction of (hetero)aryl halides (including electron-rich aryl chlorides) to (hetero)aryl radicals through single electron transfer. Based on this new photocatalyst, a novel and efficient photocatalytic protocol for the intermolecular oxyarylation of olefins with aryl halides and TEMPOH was developed. The developed
Synthesis of Chiroptical Molecular Switches by Pd-Catalyzed Domino Reactions
作者:Lutz F. Tietze、Alexander Düfert、Florian Lotz、Lars Sölter、Kawon Oum、Thomas Lenzer、Tobias Beck、Regine Herbst-Irmer
DOI:10.1021/ja906260x
日期:2009.12.16
New photochromic switches based on helical alkenes can quickly and efficiently be accessed by Pd-catalyzed domino reactions using a modular approach; this allows a wide variability in product formation with the advantages of a convergent synthetic route. The alkenes have been synthesized in excellent enantioselectivity and their switching properties assessed by stimulation with nanosecond laser pulses
From Ynamides to Highly Substituted Benzo[<i>b</i>]furans: Gold(I)-Catalyzed 5<i>-endo-dig</i>-Cyclization/Rearrangement of Alkylic Oxonium Intermediates
作者:Maria Camila Blanco Jaimes、Vanessa Weingand、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/chem.201301595
日期:2013.9.9
A series of arylynamides with alkyloxy groups at the ortho position of the aryl group was prepared through a short alkylation/cross‐coupling/amidation sequence. The gold‐catalyzed conversion of these substrates combined both CO and CC formation steps, thus providing benzofurans with amine functionalities at the 2‐position and alkyl groups at the 3‐position. Cross‐over experiments showed that the
Cathodic Radical Cyclisation of Aryl Halides Using a Strongly‐Reducing Catalytic Mediator in Flow
作者:Ana A. Folgueiras‐Amador、Alexander E. Teuten、Mateo Salam‐Perez、James E. Pearce、Guy Denuault、Derek Pletcher、Philip J. Parsons、David C. Harrowven、Richard C. D. Brown
DOI:10.1002/anie.202203694
日期:2022.8.26
Cathodic radicalcyclisations of aryl halides have been achieved in an undivided flow electrolysis cell, using phenanthrene as mediator in loadings down to 0.05 equiv, and without the requirement for a sacrificial anode. It is proposed that mediated homogeneous electron transfer proceeds in a reaction layer detached from the cathode, accounting for the observed selectivity.
Direct Functionalization of Lithium Phosphine Oxides Bearing an Alkyne Chain
作者:Hamdi Sanaa、Ali Samarat、Muriel Durandetti
DOI:10.1002/ejoc.202200738
日期:2022.9.20
Selective hydrophosphorylation of carbonyl bonds was developed via a lithium phosphineoxide intermediate, resulting in intermolecular addition to an aldehyde, instead of the intramolecular cyclisation pathway. Valuable alkynyl phosphorated alcohols were obtained in good yields and moderate diastereoselectivity.