申请人:American Home Products Corporation
公开号:US04727183A1
公开(公告)日:1988-02-23
Disclosed herein is a process for producing an asymmetric indoline-2-carboxylic acid of the structural Formula: ##STR1## wherein X is hydrogen, bromine, chlorine, C.sub.1-4 alkyl or C.sub.1-4 alkoxy, which comprises: (a) assymetrically reducing an o-nitrophenylpyruvic acid III by contacting the acid III with a reducing complex formed from (R)-proline or (S)-proline, respectively, and sodium borohydride in an inert solvent to form, respectively, an (S) or (R)-.alpha.-hydroxy-2-nitrobenzenepropanoic acid IV; (b) reacting, respectively, said (S) or (R)-.alpha.-hydroxy-2-nitrobenzenepropanoic acid III with a Vilsmeier chlorinating reagent in which the chlorinating agent thereof is selected from a group consisting of thionyl chloride, oxalyl chloride, phosphorus oxychloride, phosphorus pentachloride and sulfuryl chloride and the amide thereof is selected from a group consisting of dimethylformamide, diethylformamide, dimethylacetamide and diethylacetamide, said reaction being run at temperatures of at least 20.degree. C., in order to obtain, respectively, and (R) or (S)-.alpha.-chloro-2-nitrobenzenepropanoic acid IV; (c) reducing the nitro group of said (R) or (S)-.alpha.-chloro-2-nitrobenzenepropanoic acid (V) to an amino group; and (d) cyclizing the resulting (R) or (S)-.alpha.-chloro-2-aminobenzenepropanoic acid in aqueous base.
本文公开了一种制备不对称吲哚-2-羧酸的方法,其结构式为:##STR1## 其中X为氢、溴、氯、C.sub.1-4烷基或C.sub.1-4烷氧基,包括以下步骤:(a)将o-硝基苯丙酮酸III与(R)-脯氨酸或(S)-脯氨酸及氢化硼钠在惰性溶剂中形成还原复合物,以非对称还原的方式,分别形成(S)或(R)-α-羟基-2-硝基苯丙酸IV;(b)将(S)或(R)-α-羟基-2-硝基苯丙酸IV与维尔斯迈尔氯化试剂反应,所述氯化试剂的氯化剂选自一组,包括氯化硫酰、草酰氯、氧化三磷酰、五氯化磷和氯化亚磺基,其酰胺选自一组,包括二甲基甲酰胺、二乙基甲酰胺、二甲基乙酰胺和二乙基乙酰胺,在至少20°C的温度下进行反应,以分别获得(R)或(S)-α-氯-2-硝基苯丙酸IV;(c)还原(R)或(S)-α-氯-2-硝基苯丙酸(V)的硝基基团为氨基基团;(d)在水性碱中环化所得的(R)或(S)-α-氯-2-氨基苯丙酸。