503188-05-4Relevant academic research and scientific papers
Bioactive imidamide-based compounds targeted against nitric oxide synthase
Arias, Fabio,Duarte, Juan,Franco-Montalban, Francisco,Romero, Miguel,Dora Carrión, M.,Encarnación Camacho, M.
, (2022/02/09)
The selective inhibition of inducible nitric oxide synthase (iNOS) has become an interesting goal for the treatment of diseases where the immune and inflammatory response of the organism is involved. Septic shock is one prominent example of this type of affections. In this paper, the design and synthesis of twelve substituted pyridinyl- imidamide derivatives is described, together with their biological evaluation as NOS inhibitors. The most potent and selective compound was N-(3-hydroxy-3-(pyridin-3-yl)propyl)acetimidamide 9a (IC50 = 4.6 μM, against iNOS). Pharmacological assays in aortic rat tissue, have confirmed its inhibitory activity on iNOS and the absence of undesired cardicovascular effects. In silico analysis of the most promising compounds (9a, 9b, 9e and 9g) have predicted good drug-likeness properties. Furthermore, they have shown an adequate cell viability. Docking studies carried out on 9a suggest a particular binding mode that involves the essential residue Glu377, and might explain its iNOS selectivity. From a chemical point of view, the article describes an unusual cyclization to obtain pyridinyl-pyrimidine derivatives with high yield.
Metal or ammonium alginates as Lewis base catalysts for the 1,2-addition of silyl nucleophiles to carbonyl compounds
Verrier, Cécile,Oudeyer, Sylvain,Dez, Isabelle,Levacher, Vincent
supporting information; experimental part, p. 1958 - 1960 (2012/05/19)
Several metal (Na+, Ca2+) or ammonium (n-Bu 4N+) derivatives of alginic acid, an abundant bio-polymer obtained from the cell walls of brown algae, were synthesized. Their potential to act as organocatalysts to catalyze the 1,2-addition of various silyl derivatives to carbonyl compounds was evaluated for the first time. Ammonium alginate 1h is able to promote the reaction in modest to good isolated yields (up to 98%) affording access to a large range of substrates (β-cyano alcohols or ester, β-substituted methylacrylate or acrylonitrile, and cyanohydrin) by using only 5 mol % of catalyst.
One-pot nitrile aldolization/hydration operation giving β-hydroxy carboxamides
Goto, Akihiro,Naka, Hiroshi,Noyori, Ryoji,Saito, Susumu
supporting information; experimental part, p. 1740 - 1743 (2011/12/16)
Rhodium to the rescue: The formal aldol products of carboxamides (CONH 2) were obtained by using a RhI(OR) (R=H, Me) catalyst under essentially neutral pH and ambient conditions. This novel aldol strategy is based on the catalytic al
RhI-catalyzed aldol-type reaction of organonitriles under mild conditions
Goto, Akihiro,Endo, Kohei,Ukai, Yu,Irle, Stephan,Saito, Susumu
, p. 2212 - 2214 (2008/12/22)
An aldol-type reaction of organonitriles with aldehydes was catalyzed by a RhI(OR) species under ambient conditions, and the reaction displayed a broad substrate scope with respect to both organonitrile and aldehyde components. The Royal Societ
Efficient Lipase-Catalyzed Kinetic Resolution and Dynamic Kinetic Resolution of β-Hydroxy Nitriles. Correction of Absolute Configuration and Transformation to Chiral β-Hydroxy Acids and γ-Amino Alcohols
Pamies, Oscar,Baeckvall, Jan-E.
, p. 947 - 952 (2007/10/03)
Chemoenzymatic dynamic kinetic resolution of β-hydroxy nitriles 1 has been carried out using Candida antarctica lipase B and a ruthenium catalyst. The use of a hydrogen source to depress ketone formation in the dynamic kinetic resolution yields the corresponding acetates 2 in good yield and high enantioselectivity. It is shown that the ruthenium catalyst and the enzyme can be recycled when used in separate reactions. We also report on the preparation of various enantiomerically pure β-hydroxy acid derivatives and γ-amino alcohols from 1 and 2. The latter compounds were also used to establish the correct absolute configuration of 1 and 2.
Efficient Lipase-Catalyzed Kinetic Resolution and Dynamic Kinetic Resolution of β-Hydroxy Nitriles. A Route to Useful Precursors for γ-Amino Alcohols
Pàmies, Oscar,B?ckvall, Jan-E.
, p. 726 - 731 (2007/10/03)
An efficient kinetic resolution of racemic β-hydroxy nitriles 1 was performed via Candida antarctica lipase (N-435)-catalyzed transesterification. A variety of racemic alkyl, aryl, and aryloxymethyl substituted β-hydroxy nitriles was efficiently transformed to the corresponding enantiomerically pure acetates (ee > 99% and conversion = 50%) with E values from 40 to > 1000. The combination of the enzymatic kinetic resolution with a ruthenium-catalyzed alcohol racemization led to a dynamic kinetic resolution (ee's up to 99%, yields up to 85%).
