A new class of N-doped ionic PAHs<i>via</i>intramolecular [4+2]-cycloaddition between arylpyridines and alkynes
作者:Ravindra D. Mule、Aslam C. Shaikh、Amol B. Gade、Nitin T. Patil
DOI:10.1039/c8cc05743e
日期:——
Reported herein, for the first time, is a copper-promoted intramolecular [4+2]-cycloaddition cascade to access ionic N-doped polycyclic aromatic hydrocarbons (PAHs) with tunable emission wavelengths. It is shown that the reaction can be made catalytic with respect to Cu(OTf)2 when an external oxidant, Selectfluor, was used.
Asymmetric synthesis of heteroaryl atropisomers via a gold-catalyzed cycloisomerization–amination cascade reaction
作者:Rui Guo、Kang-Nan Li、Bin Liu、Hua-Jie Zhu、Yu-Meng Fan、Liu-Zhu Gong
DOI:10.1039/c4cc01397b
日期:——
The chiral gold(i) complex enables enantioselective cycloisomerization-amination of 2-(alkynyl)phenyl boronic acids and diazenes in high yields. A wide scope of substrates bearing various functional groups was tolerated to generate structurally different hydrazide derivatives as a new type of atropisomer.
Synthesis of substituted benzooxaborinin-1-ols via palladium-catalysed cyclisation of alkenyl- and alkynyl-boronic acids
作者:Laure Benhamou、Daniel W. Walker、Dejan-Krešimir Bučar、Abil E. Aliev、Tom D. Sheppard
DOI:10.1039/c6ob01419d
日期:——
Two newpalladium-catalysed reactions have been developed for the synthesis of stable 4-substituted benzooxaborinin-1-ols. A palladium-catalysed cyclisation of ortho-alkenylbenzene boronic acids can be used to access 4-chlorobenzooxaborinin-1-ols via a Wacker-type oxidation and chlorination. Alternatively, ortho-alkynylbenzene boronic acids undergo a palladium-catalysed oxyallylation reaction to provide
Efficient access to alkynylated quinalizinones via the gold(<scp>i</scp>)-catalyzed aminoalkynylation of alkynes
作者:Popat S. Shinde、Aslam C. Shaikh、Nitin T. Patil
DOI:10.1039/c6cc03414d
日期:——
Gold-catalyzed aminoalkynylation of alkynes for the synthesis of quinalizinones has been reported. For instance, the reaction of pyridinoalkynes with 1-[(triisopropylsilyl)-ethynyl]-1,2-benziodoxol-3(1H)-one (TIPS-EBX) in the presence of catalytic amount of AuCl at...
Enantioselective Synthesis of 1‐Aryl Benzo[5]helicenes Using BINOL‐Derived Cationic Phosphonites as Ancillary Ligands
作者:Pablo Redero、Thierry Hartung、Jianwei Zhang、Leo D. M. Nicholls、Guo Zichen、Martin Simon、Christopher Golz、Manuel Alcarazo
DOI:10.1002/anie.202010021
日期:2020.12.21
The synthesis of unprecedented BINOL‐derived cationic phosphonites is described. Through the use of these phosphanes as ancillary ligands in AuI catalysis, a highly regio‐ and enantioselective assembly of appropriately designed alkynes into 1‐(aryl)benzo[5]carbohelicenes is achieved. The modularsynthesis of these ligands and the enhanced reactivity that they impart to AuI‐centers after coordination