Reaction of aromatic aldehydes with β-dicarbonyl compounds in a catalytic system: Piperidinium acetate-1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid
作者:E. S. Putilova、N. A. Troitskii、S. G. Zlotin
DOI:10.1007/s11172-005-0386-1
日期:2005.5
Condensation of aromatic (heteroaromatic) aldehydes with 1,3-dicarbonyl compounds under the 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) ionic liquid-piperidinium acetate catalytic system (0.2 equiv. of each component) in the absence of a solvent affords, depending on the structures of the reagents, 2-arylidene derivatives of methyl acetoacetate and acetylacetone, diethyl 2,4-bis(trifluoroacetyl)-3-phenylpentanedioate, or dimethyl 2-aryl-4-hydroxy-6-oxocyclohexane-1,3-dicarboxylates. The reactions of the resulting 2-arylidene derivatives with O-methylisourea in the [Bmim][BF4] ionic liquid produced methyl 2-methoxy-4-methyl-6-aryldihydropyrimidine-5-carboxylates and 1-(2-methoxy-4-methyl-6-phenyldihydropyrimidin-5-yl)ethanone (mixtures of 3,6- and 1,6-dihydro isomers), which were transformed into the corresponding 3,4-dihydropyrimidin-2(1H)-one derivatives.
FeCl 3 ·6H 2 O-catalyzed selective conjugate reduction of alkylidene- β -keto esters and alkylidene-1,3-diketones
作者:Lakshmi V.R. Babu Syamala、Trimbak B. Mete、Ramakrishna G. Bhat
DOI:10.1016/j.tetlet.2018.07.041
日期:2018.8
system is successfully developed for the selective conjugate reduction of carbon-carbon double bond of Michael acceptor-alkylidene-β-keto esters and alkylidene-1,3-diketones under mild reaction conditions to afford the corresponding saturated β-keto esters and 1,3-diketones. The process involves the iron-catalyzed hydrosilylation, followed by in situ hydrolysis of silyl enol ether. The optimal reaction
成功开发了FeCl 3 ·6H 2 O /三乙基硅烷复合催化剂体系,用于在温和的反应条件下选择性共轭还原迈克尔受体-亚烷基-β-酮酯和亚烷基-1,3-二酮的碳-碳双键,从而得到相应的饱和β-酮酯和1,3-二酮。该方法涉及铁催化的氢化硅烷化,然后原位水解甲硅烷基烯醇醚。最佳反应条件包括20 mol%的FeCl 3 ·6H 2室温下在二氯甲烷中加入O和三乙基硅烷。各种各样的底物以1、4选择性的方式还原,从而以极好的收率得到相应的饱和化合物。
Discovery of Novel Cyanodihydropyridines as Potent Mineralocorticoid Receptor Antagonists
作者:Graciela B. Arhancet、Scott S. Woodard、Kaliappan Iyanar、Brenda L. Case、Rhonda Woerndle、Jessica D. Dietz、Danny J. Garland、Joe T. Collins、Maria A. Payne、James R. Blinn、Silvia I. Pomposiello、Xiao Hu、Marcia I. Heron、Horng-Chih Huang、Len F. Lee
DOI:10.1021/jm100506y
日期:2010.8.26
recently reported to possess excellent mineralocorticoid receptor (MR) antagonist in vitro potency and no calcium channel-blocker (CCB) activity. In the present study, we report the structure−activity relationships of this novel series of cyano ester dihydropyridines that resulted in R6 substituted analogues with improved metabolic stability while maintaining excellent MR antagonistactivity and selectivity
Diastereoselective multicomponent synthesis of (4RS,6SR)-4,6-diaryl-5,5-dicyano-2-methyl-1,4,5,6-tetrahydropyridine-3-carboxylates
作者:A. N. Vereshchagin、K. A. Karpenko、T. M. Iliyasov、M. N. Elinson、E. O. Dorofeeva、A. N. Fakhrutdinov、M. P. Egorov
DOI:10.1007/s11172-018-2327-9
日期:2018.11
Multicomponent reaction of benzylidenemalononitrile, 2-acetyl-3-arylacrylates, and aqueous ammonia in alcohols at room temperature proceeds stereoselectively to give (4RS,6SR)-4,6-diaryl-5,5-dicyano-2-methyl-1,4,5,6-tetrahydropyridine-3-carboxylates in 55–87% yields. In this reaction, ammonia acts as both the catalyst and the source of nitrogen for constructing tetrahydropyridine cycle.
The reaction of carbanions derived from Hantzsch1,4-dihydropyridines with alkyl halides was studied and methods for mono- and di-alkylation were devised.