[2.2]Paracyclophanes with N-Heterocycles as Ligands for Mono- and Dinuclear Ruthenium(II) Complexes
作者:Carolin Braun、Martin Nieger、Werner R. Thiel、Stefan Bräse
DOI:10.1002/chem.201703291
日期:2017.11.2
Bridge over troubled heterocycles: Herein we present the synthesis of mono- and homodisubstituted [2.2]paracyclophanes with additional N-donor substituents as a starting point for the [2.2]paracyclophane scaffold as a bridging ligand. Afterwards the cycloruthenation of [2.2]paracyclophanes with various N-heterocycles as substituents is explored.
Regiospecific Reductive Elimination from Diaryliodonium Salts
作者:Bijia Wang、Joseph W. Graskemper、Linlin Qin、Stephen G. DiMagno
DOI:10.1002/anie.201000695
日期:2010.6.1
Out‐of‐plane steric bulk furnished by a cyclophane substituent on iodine(III) strongly destabilizes the transition state in the reductiveelimination from diaryliodonium salts and leads to regiochemical control (dubbed SECURE), as is demonstrated by computational and experimental studies. This approach should be general for high‐valent main‐group and transition metal ions. X=N3, OAc, PhO, CF3CH2O,
Unprecedented Directing Group Ability of Cyclophanes in Arene Fluorinations with Diaryliodonium Salts
作者:Joseph W. Graskemper、Bijia Wang、Linlin Qin、Kiel D. Neumann、Stephen G. DiMagno
DOI:10.1021/ol201080c
日期:2011.6.17
diaryliodonium fluorides. The 5-methoxy[2.2]paracyclophan-4-yl directing group simultaneously reduces unproductive aryne chemistry and eliminates ligand exchange reactions by a combination of steric and electronic effects. Use of the cyclophane directing group permits an unprecedented degree of control in fluorination reactions of diaryliodonium salts.
Planar Chiral Triazole-Based Phosphanes Derived from [2.2]Paracyclophane and Their Activity in Suzuki Coupling Reactions
作者:Jean E. Glover、David J. Martin、Paul G. Plieger、Gareth J. Rowlands
DOI:10.1002/ejoc.201201601
日期:2013.3
synthesis of a variety of planarchiraltriazole-basedphosphanes. These molecules have been readily prepared from 4-azido[2.2]paracyclophane in two steps. It was observed that the stability of the resulting phosphanes was dependent on the C-4 substituent. The efficacy of the new phosphanes in the palladium-mediated Suzuki–Miyaura couplingreaction was evaluated. The phosphanes proved to be more effective
A versatile synthesis of 1,2,3-triazolyl-4-phosphines from the borane complexes of phosphino-alkynes is reported. The efficiency of the procedure relies on the use of readily available silyl-protected alkynylphosphine-boranes, which were subjected to desilylation with TBAF followed by copper-catalyzed azide–alkyne-cycloaddition in one pot. Subsequent treatment with DABCO afforded the targeted triazolylphosphines in high yields. The reported method was applied to the synthesis of the first example of an enantioenriched P-stereogenic triazolylphosphine (98.8% ee).