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.
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...
Ready synthesis of free N-H 2-arylindoles via the copper-catalyzed amination of 2-bromo-arylacetylenes with aqueous ammonia and sequential intramolecular cyclization
A wide range of free N-H 2-arylindoles were synthesised via the copper(II)-catalyzed amination of 2-bromo-arylacetylenes with aqueousammonia and sequential intramolecular cyclization. The convenience and atom economy of aqueousammonia, and the low cost of the copper catalytic system make this protocol readily superior in practical application.
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