Reductions of activated carbonyl compounds with chiral-bridged 1,4-dihydropyridines. An investigation of scope and structural effects
作者:Auke G. Talma、Patrick Jouin、Johannes G. De Vries、C. B. Troostwijk、Gerard H. Werumeus Buning、Jan K. Waninge、Johnny Visscher、Richard M. Kellogg
DOI:10.1021/ja00299a038
日期:1985.6
bridged macrocyclic 1,4-dihydropyridines (7) have been synthesized by starting from valine, alanine, phenylglycine, phenylalanine, and proline. Various bridges of different compositions, lengths, and shapes have been incorporated. All these bridged compounds in a nonprotic solvent like CH3CN in the presence of a stoichiometric amount of Mg(ClO4)2·1.5H2O reduce activatedcarbonylcompounds to the corresponding
Iodobenzene Dichloride in the Esterification and Amidation of Carboxylic Acids: In-Situ Synthesis of Ph<sub>3</sub>PCl<sub>2</sub>
作者:Myriam S. Carle、Grace K. Shimokura、Graham K. Murphy
DOI:10.1002/ejoc.201600714
日期:2016.8
A novel, in-situ synthesis of dichlorotriphenylphosphorane (Ph3PCl2) is accomplished upon combining PPh3 and the easily prepared hypervalent iodine reagent iodobenzene dichloride (PhICl2). The phosphorane is selectively generated in the presence of carboxylic acid or alcohol residues to rapidly produce acyl chlorides and alkyl chlorides in high yields. Addition of EtOH, PhOH, BnOH, Et2NH or CH2N2 results
found to be an excellent Cu(II) carrier in the transportthrough a chloroform liquidmembrane. It can selectively and efficientlytransport Cu(II) from a weakly acidic aqueous solution containing Cu(II), Zn(II), Ni(II), and Co(II). Several N,N′-di(8-quinolyl)glutaramide derivatives and their analogues have been prepared for comparison of this transport ability, which largely depends not only upon the
Complexes of uranyl chloride and thorium and uranium tetrachlorides with dicarboxylic acid amides
作者:K. W. Bagnall、D. Brown、P. J. Jones
DOI:10.1039/j19660000741
日期:——
(TMGA), and -3,3-dimethylglutaramide (HMGA) complexes with uranyl chloride and with thorium and uraniumtetrachloride have been prepared in acetone. These have the compositions UO2Cl2,1·5TMMA (or TMGA), UO2Cl2,HMMA (or HMGA), ThCl4,2TMMA, ThCl4,1·5TMGA (HMMA or HMGA), UCl4,1·5TMMA (TMGA or HMGA), and UCl4,HMMA. Some chemical and physical properties of the complexes are reported.
Small molecule inhibitors of plasminogen activator inhibitor (PAI)-1 have been reported to date but their clinical effects still remain unknown. The present study was undertaken to investigate the structure–activity relationships (SAR) of newly synthesized 2-acylamino-3-thiophenecarboxylic acid dimers based upon a core structure of TM5001 (1) and TM5007 (2) that we have previously identified as orally effective PAI-1 inhibitors. In general, compounds possessing bulky or/and hydrophobic substituents (e.g. phenyl, isobutyl group) on the both thiophene rings showed potent PAI-1 inhibitory activities irrespective of the positions of the substitution. The mono-carboxyl derivative (10) exhibited PAI-1 inhibition comparable to the corresponding dicarboxyl compound (9f).