Process for the preparation of alpha-aryl-propionic acids and their alkaline salts
申请人:Montedison S.p.A.
公开号:EP0076722A1
公开(公告)日:1983-04-13
A process is described for the preparation of alpha-aryl-propionic acids and their alkaline salts having the formula (I):
wherein Ar represents an aromatic, heteroaromatic group containing one or several rings linked together, having overall up to 20 carbon atoms, preferably chosen from amongst phenyl-, naphthyl-, diphenyl- and thienyl groups, these in turn being possibly substituted by groups inert under reaction conditions, preferably chosen from amongst: alkyl-, cycloalkyl- and aryl- groups optionally substituted, halogens, alkoxyl groups, phenoxyl groups, ketone groups, by reaction with carbon monoxide of the corresponding secondary halides of formula (II):
wherein: Ar has already been defined, while X is a halogen chosen from Cl or Br, and which process is characterized in that the reaction is conducted in an anhydrous alcohol solvent consisting of alkanols having up to 4 carbon atoms, in the presence of alkaline hydroxides, and in the further presence of a cobalt hydrocarbonyl salt, optionally supported on resins, or of one of its precursors, at a temperature comprised between 0°C and 50°C and under substantially atmospheric pressure.
The products thus obtained have a particular use in the field of pharmaceutics (analgesics, antipyretics, etc.) and as intermediates for chemical syntheses in general in the field of high-purity chemicals, and of phytodrugs.
本发明描述了一种制备式(I)的α-芳基丙酸及其碱性盐的工艺:
其中 Ar 代表芳香族、杂芳香族基团,包含一个或多个连接在一起的环,总计最多 20 个碳原子,最好选自苯基、萘基、二苯基和噻吩基,这些基团又可能被反应条件下的惰性基团取代,最好选自以下基团:任选取代的烷基、环烷基和芳基、卤素、烷氧基、苯氧基、酮基,通过与一氧化碳反应制得相应的式 (II) 的仲卤化物:
其中该工艺的特点是,反应是在由碳原子数不超过 4 个的烷醇组成的无水醇溶剂中,在碱性氢氧化物的存在下,以及在钴烃基盐(可选择在树脂上支撑)或其前体之一的存在下,在 0°C 至 50°C 的温度范围内,基本上在大气压力下进行的。
这样得到的产品特别适用于制药领域(镇痛药、解热镇痛药等),也可用作高纯度化学品和植物药领域一般化学合成的中间体。