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.
Oxidative Intramolecular 1,2‐Amino‐Oxygenation of Alkynes under Au
<sup>I</sup>
/Au
<sup>III</sup>
Catalysis: Discovery of a Pyridinium‐Oxazole Dyad as an Ionic Fluorophore
作者:Aslam C. Shaikh、Dnyanesh S. Ranade、Pattuparambil R. Rajamohanan、Prasad P. Kulkarni、Nitin T. Patil
DOI:10.1002/anie.201609335
日期:2017.1.16
Oxidative intramolecular 1,2‐amino‐oxygenation reactions, combining gold(I)/gold(III) catalysis, is reported. The reaction provides efficient access to a structurally unique ionic pyridinium‐oxazole dyad with tunable emission wavelengths. The application of these fluorophores as potential biomarkers has been investigated.
Gold-Catalyzed Cycloisomerization of Pyridine-Bridged 1,8-Diynes: An Expedient Access to Luminescent Cycl[3.2.2]azines
作者:Chetan C. Chintawar、Manoj V. Mane、Akash G. Tathe、Suprakash Biswas、Nitin T. Patil
DOI:10.1021/acs.orglett.9b02677
日期:2019.9.6
Gold-catalyzed diyne cycloisomerizations involving carbene/alkyne metathesis have been the focal point of attention for the past few years as it offers great potential to build complex polycyclic architectures. However, the design of novel cycloisomerizations has been mostly limited to 1,5/1,6- diynes and has remained very challenging to apply for higher 1,n-diynes. Herein, we disclose an unprecedented
Selective Synthesis of Phenanthrenes and Dihydrophenanthrenes via Gold-Catalyzed Cycloisomerization of Biphenyl Embedded Trienynes
作者:Ana Milián、Patricia García-García、Adrián Pérez-Redondo、Roberto Sanz、Juan J. Vaquero、Manuel A. Fernández-Rodríguez
DOI:10.1021/acs.orglett.0c03067
日期:2020.11.6
Readily available o′-alkenyl-o-alkynylbiaryls, a particular type of 1,7-enynes, undergo a selective cycloisomerization reaction in the presence of a gold(I) catalyst to give interesting phenanthrene and dihydrophenanthrene derivatives in high yields. The solvent used provokes a switch in the evolution of the gold intermediate and plays a key role in the reaction outcome.
Synthesis of Substituted Phenanthrene by Iron(III)-Catalyzed Intramolecular Alkyne–Carbonyl Metathesis
作者:Krishnendu Bera、Soumen Sarkar、Swapnadeep Jalal、Umasish Jana
DOI:10.1021/jo301371n
日期:2012.10.5
An efficient synthesis of functionalized phenanthrenes has been developed for the first time involving an iron(III)-catalyzed intramolecular coupling of 2′-alkynyl-biphenyl-2-carbaldehydes. A broad range of functionalized phenanthrene derivatives could be obtained in the present method in moderate to good yields with high chemo- and regioselectivity. This transformation can also be applied to the synthesis