A Metal-Free Approach for the Synthesis of 2-Tetralones via
Carbanion-Induced Ring Transformation of 2H-Pyran-2-ones
作者:Fateh Singh、Samata Shetgaonkar
DOI:10.1055/s-0036-1591591
日期:2018.9
economical and tolerates a wide range of functional groups. A metal-free, ultrasound-assisted approach for the synthesis of highly functionalized 2-tetralones in high yields is described. The process involves ringtransformation of 2H-pyran-2-ones with the spirocyclic ketone 1,4-cyclohexandione monoethylene ketal to yield spirocyclic ketals and subsequent acid-mediated hydrolysis. This protocol is free from
Regioselective synthesis of 2-amino-isophthalonitriles through a ring transformation strategy
作者:Fateh V. Singh、Vijay Kumar、Brijesh Kumar、Atul Goel
DOI:10.1016/j.tet.2007.08.056
日期:2007.11
An expeditioussynthesis of several 2-amino-isophthalonitriles and their biaryl compounds is described and illustrated by carbanion-induced ring transformation of functionalized 2H-pyran-2-ones with malononitrile in excellent yields. The strength of the reaction lies in the creation of an aromatic ring at room temperature from six-membered lactones under mild reaction conditions. This approach is an
Arylanthranilodinitriles: A new biaryl class of antileishmanial agents
作者:Fateh V. Singh、Rit Vatsyayan、Uma Roy、Atul Goel
DOI:10.1016/j.bmcl.2006.02.012
日期:2006.5
A series of anthranilodinitrile-based biaryls were synthesized and evaluated in vitro against extracellular promastigotes and intracellular amastigotes of Leishmania donovani. Among various screened compounds, a biaryl with trifluoromethyl group 5f showed 83% inhibition against promastigotes and 70% inhibition against amastigotes of L. donovani at 8 and 20 mu g/mL concentrations, respectively. (C) 2006 Elsevier Ltd. All rights reserved.
In the title compound, C15H13NO3S, the two six-membered rings are inclined at an angle of 38.9(1)degrees. The conformations of the ring substituents are discussed and compared with the situation when the 5-methyl substituent is replaced with an H atom.
5,6-Diarylanthranilo-1,3-dinitriles as a new class of antihyperglycemic agents
作者:Fateh V. Singh、Amrita Parihar、Sumit Chaurasia、Amar B. Singh、Salil P. Singh、Akhilesh K. Tamrakar、Arvind K. Srivastava、Atul Goel
DOI:10.1016/j.bmcl.2009.02.118
日期:2009.4
Various functionalized mono- and diarylanthranilo-1,3-dinitriles were synthesized and evaluated for their in vitro antihyperglycemic activity against the PTP-1B, glucose-6-phosphatase, glycogen phosphorylase and alpha-glucosidase enzymes. Among various screened compounds, 5,6-diaryl substituted anthranilo1,3-dinitriles 3a, 3b, and 3d showed good inhibitory activity against PTP-1B with IC50 values of 58 72 mu M. Three of the test compounds showed significant (25-37%) lowering of plasma glucose level at 24 h in sucrose-challenged streptozotocin-induced diabetic Sprague-Dawley rat model. (C) 2009 Elsevier Ltd. All rights reserved.