Evaluation of glycolamide esters and various other esters of aspirin as true aspirin prodrugs
作者:Niels Moerk Nielsen、Hans Bundgaard
DOI:10.1021/jm00123a040
日期:1989.3
aryl esters of acetylsalicylic acid (aspirin) were synthesized and evaluated as potential prodrug forms of aspirin. N,N-Disubstituted glycolamide esters were found to be rapidly hydrolyzed in human plasma, resulting in the formation of aspirin as well as the corresponding salicylate esters. These in turn hydrolyzed rapidly to salicylic acid. The largest amount of aspirin formed from the esters were
Glycolamide Esters as Biolabile Prodrugs of Carboxylic Acid Agents: Synthesis, Stability, Bioconversion, and Physicochemical Properties
作者:Niels Mørk Nielsenw、Hans Bundgaard
DOI:10.1002/jps.2600770402
日期:1988.4
be a useful biolabile prodrug type for several carboxylic acidagents. The esters combine a high susceptibility to undergo enzymatic hydrolysis in plasma with a high stability in aqueoussolution. Furthermore, as demonstrated with the benzoicacid model esters, it is feasible to obtain ester derivatives with almost any desired water solubility or lipophilicity with retainment of marked lability to enzymatic
Cu(I)-Catalyzed Carboxylative Coupling of Terminal Alkynes, Allylic Chlorides, and CO<sub>2</sub>
作者:Wen-Zhen Zhang、Wen-Jie Li、Xiao Zhang、Hui Zhou、Xiao-Bing Lu
DOI:10.1021/ol102172v
日期:2010.11.5
A highly selective synthesis of a variety of functionalized allylic 2-alkynoates was realized via the carboxylative coupling of terminalalkynes, allylic chlorides, and CO2 catalyzed by the N-heterocyclic carbene copper(I) complex (IPr)CuCl. The catalyst can be easily recovered without any loss in activity and product selectivity.
Manganese-Promoted Regioselective Ring-Opening of 2,3-Epoxy Acid Derivatives: A New Route to α-Hydroxy Acid Derivatives
作者:José M. Concellón、Pablo L. Bernad、Humberto Rodríguez-Solla、Pamela Díaz
DOI:10.1002/adsc.200900257
日期:2009.9
amides as starting materials, the corresponding 3-aryl-2-hydroxy amides in enantiopure form are also available. Some synthetic applications of selected examples of 3-aryl-2-hydroxy carboxylic acidderivatives are shown. A mechanism has been proposed to explain this novel reaction.
Synthesis of (E)-α-Hydroxy-β,γ-Unsaturated Amides with High Selectivity fromα,β-Epoxyamides by Using Catalytic Samarium Diiodide or Triiodide
作者:José M. Concellón、Pablo L. Bernad、Eva Bardales
DOI:10.1002/chem.200305375
日期:2004.5.17
stereoselective synthesis of (E)-alpha-hydroxy-beta,gamma-unsaturated amides starting from alpha,beta-epoxyamides, by using catalytic SmI2 or SmI3, was achieved. This transformation can also be carried out by using SmI2 generated in situ from samarium powder and diiodomethane. The starting compounds1 are easily prepared by the reaction of enolates derived from alpha-chloroamides with ketones at -78 degrees