申请人:DSM NV
公开号:US05977406A1
公开(公告)日:1999-11-02
The invention relates to a process for preparing .alpha.-amino acid amides, the corresponding .alpha.-amino acids, or salt thereof, which are substituted at the .beta.-site with at least one (hetero)aromatic group. This is achieved according to the invention by subjecting a 4-carbamoyl-2-oxazolidinone compound, respectively a 4-carboxy-2-oxazolidinone compound, wherein each of them is substituted at the 5-site with at least one (hetero)aromatic group, to a treatment with H.sub.2 in the presence of a catalyst. The invention also relates to a process for preparing a 4-carbamoyl-2-oxazolidinone compound substituted at the 5-site with at least one (hetero)aromatic group, in which process an .alpha.-amino-.beta.-hydroxy-propane nitrile substituted at the .beta.-site with at least one (hetero)aromatic group, or a salt thereof, is subjected to a treatment in the presence of CO.sub.2 and a base.
本发明涉及制备在β位上至少被一个(杂)芳基取代的α-氨基酸酰胺、相应的α-氨基酸或其盐的过程。根据本发明,通过将在5位上至少被一个(杂)芳基取代的4-氨基甲酰基-2-噁唑啉酮化合物或4-羧基-2-噁唑啉酮化合物在催化剂存在下与H2反应来实现。本发明还涉及一种制备在5位上至少被一个(杂)芳基取代的4-氨基甲酰基-2-噁唑啉酮化合物的方法,其中在CO2和碱存在下处理α-氨基-β-羟基丙腈,在β位上至少被一个(杂)芳基取代,或其盐。