申请人:Sanofi
公开号:US04675419A1
公开(公告)日:1987-06-23
The invention relates to a process for preparing .alpha.-hydroxy-acids of general formula: ##STR1## in which R represents hydrogen or a lower alkyl radical and Cy represents a phenyl, naphthyl or heterocyclic radical, these latter three radicals optionally comprising one or more substituents selected from the group consisting of lower alkyl, lower alkenyl, lower alkynyl, lower alkoxy radicals and halogen atoms, process which comprises the treatment of an .alpha.-monohalogenated ketone of general formula: ##STR2## in which R and Cy have the same meaning as above and X represents chlorine, bromine or iodine, in the presence of an aqueous solution of an alkali metal hydroxide, a non-polar organic solvent selected from an aromatic or alicyclic hydrocarbon and oxygen in excess optionally in the presence of an inert gas, the treatment being carried out at a temperature ranging from the boiling temperature of the reaction medium at atmospheric pressure and 240.degree. C. under pressure and the alkali metal so formed is then acidified to obtain the desired acid.
该发明涉及一种制备一般式为的α-羟基酸的方法:其中R代表氢或较低的烷基基团,Cy代表苯基、萘基或杂环基团,这三个后者基团可以包含一个或多个从下列基团中选择的取代基,即较低的烷基、较低的烯基、较低的炔基、较低的烷氧基团和卤素原子,所述方法包括在存在碱金属氢氧化物的水溶液、选择的芳香族或脂环烃非极性有机溶剂和过量氧气的条件下处理一般式为的α-单卤代酮:其中R和Cy的含义与上述相同,X代表氯、溴或碘,在温度范围内进行处理,该温度范围从大气压下反应介质的沸腾温度到240°C的压力下,然后将生成的碱金属酸化以获得所需的酸。