Asymmetric Organocatalytic Cascade Michael/Hemiketalization/Retro-Aldol Reaction of 2-[(<i>E</i>)-2-Nitrovinyl]phenols with 2,4-Dioxo-4-arylbutanoates: A Convenient Access to Chiral α-Keto Esters
unprecedented organocatalyticenantioselective cascade Michael/hemiketalization/retro‐aldol reaction of 2‐[(E)‐2‐nitrovinyl]phenols and 2,4‐dioxo‐4‐arylbutanoates is described. With a bifunctional squaramide catalyst incorporating (1R,2R)‐1,2‐diphenylethane‐1,2‐diamine, the reactions afford products in 75–99% yields with 80–98% ee. This process provides an enantioselective pathway for the synthesis of chiral
Inhibitors of Mycobacterium Tuberculosis Malate Synthase, Methods of Making and Uses Thereof
申请人:Freundlich Joel S.
公开号:US20140171444A1
公开(公告)日:2014-06-19
The present invention provides aryl- or heteroaryl-diketo acid compounds effective to inhibit an activity of a Mycobacterial malate synthase enzyme or to inhibit a malate synthase activity in other bacteria having the enzyme. The compounds may be phenyl- naphthyl-, or thienyl-substituted diketo acids and carboxylate derivatives thereof. Also provided are methods of treating tuberculosis or other pathophysiological conditions associated with a malate synthase enzyme with the inhibitory compounds and methods of in silico design of the inhibitory compounds. In addition, the present invention provides the inhibitory compounds designed by this method. Furthermore, three-dimensional X-ray crystal structures of the Mycobacterial malate synthase complexed with the inhibitory compounds are provided. Further still a method for stabilizing an aromatic or heteroaromatic diketo acid or its prodrug or close analog in solution by derivatizing at least the ortho position on the aromatic ring is provided.
Synthesis and Analgesic Activity of Etyl 4-[(4-Aryl-2-hydroxy-4-oxobut-2-enoyl)amino]benzoates
作者:V. L. Gein、A. V. Romanova、O. V. Bobrovskaya、O. V. Nazarets、R. R. Makhmudov、Е. V. Gradova
DOI:10.1134/s1070363222110056
日期:2022.11
4-aminobenzoic acid ethyl ester (benzocaine, anesthesin) in glacial acetic acid in the presence of anhydrous sodium acetate gave rise to ethyl (Z)-4-(4-aryl-2-hydroxy-4-oxobut-2-enamido)benzoates. Analgesicactivity of the synthesized compounds was studied.
摘要 4-芳基-2-羟基-4-氧代丁-2-烯酸甲酯(芳酰基丙酮酸)与 4-氨基苯甲酸乙酯(苯佐卡因,麻醉剂)在无水乙酸钠存在下在冰醋酸中反应得到上升为 ( Z )-4-(4-aryl-2-hydroxy-4-oxobut-2-enamido) 苯甲酸乙酯。研究了合成化合物的镇痛活性。
Enantioselective [3 + 3] Annulation–Deoxalation Strategy for Rapid Access to δ-Oxoesters via N-Heterocyclic Carbene Catalysis
unprecedented stereoselective synthetic approach to δ-oxoesters derivatives from readily available starting materials has been developed. This method, catalyzed by N-heterocyclic carbene, involves an annulation–deoxalation reaction of alkynyl aldehydes with 2,4-diketoesters and proceeds via the chiral α,β-unsaturated acylazolium intermediates. The annulation includes the in situ formation of dihydropyranones
styrylfurans using N-heterocyclic carbenes (NHCs) and Brønstedacid catalysis. By exploiting 2,4-dioxoesters as conjugated 1,3-dicarbonyls, we have developed a technique allowing the efficient formation of highly functionalized styrylfurans with interesting photochemical properties, through a NHC-catalyzed cross-benzoin reaction followed by a Brønsted acid-driven Paal-Knorr-like condensation. This approach