[EN] PREPARATION AND METHODS OF USE FOR ORTHO-ARYL 5- MEMBERED HETEROARYL-CARBOXAMIDE CONTAINING MULTI-TARGETED KINASE INHIBITORS [FR] PRÉPARATION ET PROCÉDÉS D'UTILISATION D'ORTHO-ARYLE HÉTÉROARYLE À 5 CHAÎNONS -CARBOXAMIDE CONTENANT DES INHIBITEURS DE KINASES MULTICIBLES
[EN] PREPARATION AND METHODS OF USE FOR ORTHO-ARYL 5- MEMBERED HETEROARYL-CARBOXAMIDE CONTAINING MULTI-TARGETED KINASE INHIBITORS [FR] PRÉPARATION ET PROCÉDÉS D'UTILISATION D'ORTHO-ARYLE HÉTÉROARYLE À 5 CHAÎNONS -CARBOXAMIDE CONTENANT DES INHIBITEURS DE KINASES MULTICIBLES
syn α-benzoylamido β-hydroxy esters through asymmetrictransferhydrogenation (ATH) with a tethered Rh(III)–DPEN complex via dynamic kinetic resolution (DKR) has been developed for the first time starting from α-benzoylamido β-keto esters. A variety of α-benzoylamido β-keto esters were converted under mild conditions into the corresponding syn α-benzoylamino β-hydroxy esters with high yields (up to 98%)
The development of Ru-catalyzed asymmetric transfer hydrogenation of α-amino β-keto ester hydrochlorides is described. The reaction proceeds through dynamic kineticresolution to afford anti β-hydroxy α-amino esters with good diastereomeric ratios and high enantioselectivities.
Rhodium-Catalyzed anti and syn Enantio- and Diastereoselective Transfer Hydrogenation of α-Amino β-Keto Ester Hydrochlorides through Dynamic Kinetic Resolution
enantioselectivities (ee up to >99%). A mild catalyticasymmetrictransferhydrogenation of a series of α-amino β-keto ester hydrochlorides catalyzed by a rhodium(III) complex is reported. The use of the formic acid/triethylamine system as the hydrogen donor source provided the corresponding anti and syn amino alcohols with complete conversions, fair diastereoselectivities (up to 97:3 dr), and high enantioselectivities
Various 2-mercapto-4-substituted-5-imidazolecarboxylates (5) were synthesized by the reaction of C-acylamino acid methyl esters (4) with potassium thiocyanate. Hydrolysis followed by decarboxylation of the imidazole carboxylates (5) gave 2-mercapto-4-substituted imidazoles (8) in good yields. Furthermore, the imidazoles (8) were also directly obtained by the reaction of aminoketones (9) with potassium thiocyanate. These compounds (8) exhibited antiinflammatory activities against carrageenan-induced rat paw edema. Among the compounds tested, 2-mercapto-4-(3-thienyl) imidazole (8r) showed the best therapeutic index value, giving a value comparable to that of mefenamic acid.
The stereoselectivesynthesis of anti β-hydroxy α-amino esters by iridium–SYNPHOS-catalyzed asymmetric hydrogenation of α-amino β-keto ester hydrochlorides is reported. The reaction proceeded through dynamic kinetic resolution to afford a variety of β-hydroxy α-amino ester derivatives with good yields and high level of diastereo- and enantioselectivities (de up to 99%, ee up to 92%).