[EN] FUSED TRICYCLIC BENZIMIDAZOLES DERIVATIVES AS MODULATORS OF TNF ACTIVITY [FR] DÉRIVÉS BENZIMIDAZOLES TRICYCLIQUES CONDENSÉS COMME MODULATEURS DE L'ACTIVITÉ DU TNF
A practical and expedient synthesis of 2-heterocycle (C–N bond) substituted 4-oxo-4-arylbutanoates
摘要:
A practical and expedient synthesis of the titled compounds is described. Using the same simple procedure (DBU was reacted with the mixture of an alkynol and a nitrogen heterocycle in CH2Cl2 at rt for 16 h), a wide variety of diverse NH-containing nucleophiles such as pyrazoles, indazoles, indoles, imidazoles and benzoimidazole, oxazolidinone and benzooxazolone, triazoles, phthalimides, and N-formyl anilines, have been reacted with 4-aryl-4-hydroxy-alkynyl esters to afford good yields of desired products. This reaction proceeded by the DBU catalyzed redox isomerization of ethyl 4-aryl-4-hydroxybut-2-ynoate to (E)-ethyl 4-aryl-4-oxobut-2-enoate, followed by the DBU catalyzed aza-Michael reactions with the isomerized product in one-pot. (c) 2007 Elsevier Ltd. All rights reserved.
Copper(II) triflate effectively catalyzes the reaction of (trimethylsilyloxy)acrylic esters and acetals to form γ-alkoxy-α-keto esters. The reaction proceeds under mild conditions providing products in good to excellent yields. The substrate scope was investigated, and it was demonstrated that the products could be converted into related compounds such as γ-hydroxy-α-keto esters and α-oximes.
Treatment of non-activated alkylhalides 1 with aldehydes 3 in the presence of zinc metal and chlorotrimethylsilane (TMSCI), DMA and/or NMP in THF brought about highly facile and effective cross-coupling to give the corresponding alcohols in good yield. These reactions are assumed to proceed through zinc reagent intermediates generated in situ.
Verfahren zur stereoselektiven Reduktion von 4-Aryl-4-oxobutansäure-derivaten
申请人:BAYER AG
公开号:EP1369410A1
公开(公告)日:2003-12-10
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung stereoisomerenangereicherter 4-Aryl-4-hydroxybutansäurederivate durch Reduktion von 4-Aryl-4-ketobutansäurederivaten in Gegenwart von Ruthenium enthaltenden Katalysatoren, von mindestens einem Amin, und von Ameisensäure, Formiaten oder Mischungen davon.
Process for racemization of optically active 4-phenylbutanoic acid esters
申请人:KURARAY CO., LTD.
公开号:EP0421472A1
公开(公告)日:1991-04-10
A process for the racemization of optically active 4-phenylbutanoic acid esters which comprises treating optically active 4-phenylbutanoic acid esters of the general formula (I)
wherein R¹ represents a hydroxy group, a hydroxy group protected by a vinyl ether, or a lower acyloxy group and R² repesents a lower alkyl group with a base selected from the group consisting of alkali metal alcoholates, alkali metal hydrides, and alkali metal amides is provided.