申请人:Chaudhari Vitthal Raghunath
公开号:US20050283020A1
公开(公告)日:2005-12-22
The present invention provides for the preparation of 2-aryl propionic acids, which comprises the steps of: reacting an aryl compound selected from an arylalkyl halide having general formula I, aryl alcohol having general formula II or aryl substituted olefins having general formula III, as shown in the accompanying drawings, wherein, R
1
is aryl, substituted aryl, naphthyl or substituted naphthyl groups, R
2
, R
3
, R
4
and R
5
are independently hydrogen, alkyl, aryl, arylalkyl or cycloaliphatic groups with or without substituents and X is other a halogen atom selected from chlorine, bromine, iodine with a halide promoter, an organic acid, water and a palladium catalyst in an organic solvent selected from ketones or cyclic ethers in carbon monoxide atmosphere under homogeneous conditions, at a temperature ranging between 30 to 130° C., for a period ranging between 0.3 to 4 hrs, at pressures ranging between 50 to 1500 psig, cooling the reaction mixture to ambient temperature, flushing the reaction vessel with inert gas, removing the solvent by conventional methods, and separating the catalyst and isolating 2 aryl propionic acid having formula IV as shown in the accompanying drawings, wherein, R
1
is aryl, substituted aryl, naphthyl or substituted naphthyl groups, R
2
, R
3
, R
4
and R
5
are independently hydrogen, alkyl, aryl, arylalkyl, cycloaliphatic groups with or without substituents.
本发明提供了制备2-芳基丙酸的方法,包括以下步骤:在伴随的图示中显示的通用式I具有芳基烷基卤化物、通用式II具有芳基醇或通用式III具有芳基取代烯烃中选择的芳基化合物反应,其中,R1为芳基、取代芳基、萘基或取代萘基,R2、R3、R4和R5独立地为氢、烷基、芳基、芳基烷基或环脂族基,带或不带取代基,X为氯、溴、碘等卤素原子,通过在选择的酮或环醚有机溶剂中,在一氧化碳气氛下均相条件下,以温度在30至130°C范围内、反应时间在0.3至4小时范围内、压力在50至1500 psig范围内的条件下,与卤化促进剂、有机酸、水和钯催化剂反应,冷却反应混合物至室温,用惰性气体冲洗反应容器,通过常规方法去除溶剂,并分离催化剂并分离出具有通用式IV的2-芳基丙酸,其中,R1为芳基、取代芳基、萘基或取代萘基,R2、R3、R4和R5独立地为氢、烷基、芳基、芳基烷基、环脂族基,带或不带取代基。