Palladium meets copper: one-pot tandem synthesis of pyrido fused heterocycles via Sonogashira conjoined electrophilic cyclization
作者:Sonu Kumar、Rakesh K. Saunthwal、Trapti Aggarwal、Siva K. Reddy Kotla、Akhilesh K. Verma
DOI:10.1039/c6ob01539e
日期:——
An efficient step-economical tandem approach for the direct synthesis of pyrido fused indole, quinoline, benzofuran and benzothiophene derivatives using a bimetallic Pd/Cu catalytic system has been described. The three component reaction of o-halo aldehydes, alkynes and tert-butylamine leads to the synthesis of biologically active polyheterocycles. The present strategy involves the dual role of tert-butylamine
Copper-free Sonogashira coupling of 2-chloroquinolines with phenyl acetylene and quick annulation to benzo[b][1,6]naphthyridine derivatives in aqueous ammonia
作者:Atish Chandra、Bhawana Singh、Shraddha Upadhyay、Radhey M. Singh
DOI:10.1016/j.tet.2008.10.010
日期:2008.12
An efficient copper-freeSonogashiracoupling of 2-chloroquinolines with phenyl acetylene to 2-ethynylquinolines is described. We further discussed the one pot facile annulation of 2-alkynylquinoline-3-carboxaldehydes to 3-phenylbenzo[b][1,6]naphthyridines in aqueous ammonia in excellent yield.
描述了2-氯喹啉与苯基乙炔到2-乙炔基喹啉的有效的无铜Sonogashira偶联。我们进一步讨论了在氨水中,2-炔基喹啉-3-甲醛与3-苯基苯并[ b ] [1,6]萘啶的一锅法环氧化反应,收率很好。
Photo- and Electrochemical Redox Behavior of Cyclometalated Ru(II) Complexes Having a 3-Phenylbenzo[<i>b</i>][1,6]naphthyridine Ligand
作者:Sumanta Kumar Padhi、Koji Tanaka
DOI:10.1021/ic201207x
日期:2011.11.7
CyclometalatedRu(II) complexes having a 3-phenylbenzo[b][1,6]naphthyridine (phbn) ligand have been synthesized and characterized by spectroscopic methods. The photo- and electrochemical redox behavior of the complexes are demonstrated. Complex [Ru(phbn)(bpy)2]PF6 ([1]PF6) readily undergoes proton coupled two electron reduction by chemical, electrochemical, and photochemical methods to generate [Ru(phbnHH)(bpy)2]PF6
Chemoselective Azidation of <i>o</i>-Alkynylaldehydes over [3 + 2] Cycloaddition and Subsequent Staudinger Reaction: Access to Benzonaphthyridines/Naphthyridines
作者:Pradeep Kumar、Trapti Aggarwal、Akhilesh K. Verma
DOI:10.1021/acs.joc.7b01016
日期:2017.6.16
conditions is described. Mechanisticstudies confirm the formation of azido-pyranoquinolines through nucleophilic attack of azide on pyrilium intermediate over [3 + 2] cycloaddition of the azide on the alkyne. The synthesized azido-pyranoquinolines were transformed into benzonaphthyridines via Staudinger reaction. The mechanistic pathway was supported by deuterium labeling experiment and X-ray crystallographic