Radical-mediated dehydrative preparation of cyclic imides using (NH<sub>4</sub>)<sub>2</sub>S<sub>2</sub>O<sub>8</sub>–DMSO: application to the synthesis of vernakalant
作者:Dnyaneshwar N Garad、Subhash D Tanpure、Santosh B Mhaske
DOI:10.3762/bjoc.11.113
日期:——
efficient and new dehydrating reagent for a convenient one-pot process for the synthesis of miscellaneous cyclic imides in high yields starting from readily available primary amines and cyclic anhydrides. A plausible radical mechanism involving DMSO has been proposed. The application of this facile one-pot imide forming process has been demonstrated for a practical synthesis of vernakalant.
Substituent chemical shifts of<i>N</i>-arylsuccinanilic acids,<i>N</i>-arylsuccinimides,<i>N</i>-arylmaleanilic acids, and<i>N</i>-arylmaleimides
作者:Hye Sun Lee、Ji Sook Yu、Chang Kiu Lee
DOI:10.1002/mrc.2450
日期:2009.9
NMR spectra of a series of N-arylsuccinanilic acids, N-arylsuccinimides, N-arylmaleanilicacids, and N-arylmaleimides were examined to estimate the electronic effect of the amide and imide groups on the chemicalshifts of the hydrogen and carbon nuclei of the benzene ring.
Enzymatic amide bond formation: synthesis of aminooxo-acids through a <i>Mycobacterium smegmatis</i> acyltransferase
作者:Michael S. Christodoulou、Martina Letizia Contente、Sabrina Dallavalle、Andrea Pinto
DOI:10.1039/d2gc00655c
日期:——
substrate-to-catalyst ratio (Msubstrate/Mcatalyst: 25 000), enzymatic stability (one month without any activity loss), and excellent protein purification yields (130 mg from 2 g of wet cell paste) made this process a green and cost-efficient approach, which was successfully applied for the preparation of a key intermediate of SAHA synthesis.
Docking and quantum mechanic studies on cholinesterases and their inhibitors
作者:José Correa-Basurto、Cesar Flores-Sandoval、Jesús Marín-Cruz、Arturo Rojo-Domínguez、L. Michel Espinoza-Fonseca、José G. Trujillo-Ferrara
DOI:10.1016/j.ejmech.2006.08.015
日期:2007.1
Docking studies and density functional theory (DFT) calculations were made for 88 N-aryl derivatives and for some acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) residues. Based on this information, some compounds were synthesized and tested kinetically in vitro as AChE inhibitors.Finally, some chemical properties of the N-aryl derivatives were calculated: partition coefficient (it) and molecular electrostatic potentials (MESPs) whereas their electronic effects (rho) were taken from the literature. The results showed that all compounds act inside the AChE gorge, making pi-pi interactions and hydrogen bonds with Trp86 and Ser203 and by high HOMO energies of Ser2003 and high LUMO energies of N-aryl derivatives. These theoretical calculations for AChE are in agreement with the experimental data, whereas such calculations for BChE do not show the same behavior which could be due to in spite of both cholinesterase enzymes displaying similar functional activities they do possess important structural differences at their catalystic sites. (c) 2006 Elsevier Masson SAS. All rights reserved.