The Weinreb amides 2a,b were prepared from the α,α-dimethoxyacetic acids 1c,d. A number of representative nucleophilic additions (RMgX and RLi) on 2 afforded α-ketoacetals 3a–j in 70–99% yield. These compounds represent a versatile arrangement of functional groups of significant synthetic value, as demonstrated in the synthesis of (±)-salbutamol.
[EN] IMIDAZO-PYRIMIDINE DERIVATIVES AS LIGANDS FOR GABA RECEPTORS<br/>[FR] DERIVES D'IMIDAZO-PYRIMIDINE UTILISES COMME LIGANDS POUR LES RECEPTEURS GABA
申请人:MERCK SHARP & DOHME
公开号:WO2002074772A1
公开(公告)日:2002-09-26
A class of 3-phenylimidazo[1,2-a]pyrimidine derivatives, substituted at the meta position of the phenyl ring by a directly attached, optionally halo- and/or cyano-substituted aryl or heteroaryl group, and further substituted on the phenyl ring by one or two fluorine atoms, are selective ligands for GABAA receptors, in particular having good affinity for the α2 and/or α3 and/or α5 subunit thereof, and are accordingly of benefit in the treatment and/or prevention of adverse conditions of the central nervous system, including anxiety, convulsions and cognitive disorders.
Verfahren zur Herstellung von substituierten Pyridinen
申请人:BASF Aktiengesellschaft
公开号:EP0318845A2
公开(公告)日:1989-06-07
Die Anmeldung betrifft ein Verfahren zur Herstellung von substituierten Pyridinen der Formel (I)
durch Umsetzung von Acrolein mit Alkanalen oder deren Acetale der Formel (II) oder Ketonen der Formel (III)
in der R¹ Alkyl- mit 1 bis 12 Kohlenstoffatomen, Cycloalkyl-, Aryl- oder Aralkylreste und R² Acyl- oder Carbonylalkoxi-Reste bedeuten, und Ammoniak. Die Reaktion wird in Gegenwart von Zeolithen durchgeführt.
本申请涉及一种通过丙烯醛与式 (II) 的烷烃或其缩醛或式 (III) 的酮反应制备式 (I) 的取代吡啶的工艺
将丙烯醛与式 (II) 的烷烃或其缩醛或式 (III) 的酮反应
其中 R¹ 为 1 至 12 个碳原子的烷基、环烷基、芳基或芳烷基,R² 为酰基或羰基烷氧基,以及氨。反应在沸石存在下进行。
An aqueous process for the preparation of 5-methyl-N-(aryl)-1,2,4-triazolo (1,5-a)pyrimidine-2-sulfonamides
申请人:DOWELANCO
公开号:EP0427335A1
公开(公告)日:1991-05-15
5-Methyl-N-(aryl)-1,2,4-triazolo[1,5-a]pyrimidine-2-sulfonamides are prepared by the cyclization of N-(3-(((aryl)amino)sulfonyl)-1H-1,2,4-triazol-5-yl)amines with 4-methoxy-3-butene-2-one or its synthethic equivalents in the presence of an aqueous base. By controlling the pH of the condesation between 8.5 and 10.5, by-product formation can be substantially reduced.
Double-metal cyanide catalysts for preparing polyether polyols
申请人:BAYER ANTWERPEN N.V.
公开号:EP1360990A1
公开(公告)日:2003-11-12
The invention relates to double-metal cyanide catalysts for preparing polyols by the polyaddition of alkylene oxides on to starter compounds containing active hydrogen atoms, wherein the DMC catalysts are composed of: a) at least one double-metal cyanide compound; b) at least one organic complexing ligand; and, optionally, c) at least one functionalized polymer, wherein the organic complexing ligand is a mixture of a C3-C7 aliphatic alcohol and from about 2 to about 98 mole %, based on the total amount of organic complexing ligand, of a cyclic, aliphatic, cycloaliphatic or aromatic ketone. The DMC catalysts of the present invention have increased activity compared to known catalysts. Additionally, the DMC catalysts of the present invention can be used to prepare polyols with reduced high molecular weight components.