申请人:CELGENE CORPORATION
公开号:EP0390102A2
公开(公告)日:1990-10-03
Pyridine-2,3-dicarboxylic acids are prepared by the action of 2,3-dihydroxybenzoate-3,4-dioxygenase on 2,3-dihydroxybenzoic acids in a liquid medium which lacks active decarboxylase and which has a pH from 4 to 9, an ionic strength below about 1 molar, and a low concentration of metal cations and complex anions. In close temporal proximity, the 2-hydroxy-3-carboxymuconic acid semialdehyde which forms is allowed to react with a source of ammonia or a primary amine, avoiding substantial decarboxylation.
吡啶-2,3-二羧酸是由 2,3-二羟基苯甲酸-3,4-二氧 化酶在缺乏活性脱羧酶的液体介质中作用于 2,3-二羟基苯甲酸制备的,该介质的 pH 值为 4 至 9,离子强度低于约 1 摩尔,金属阳离子和复合阴离子的浓度较低。在时间上接近的情况下,形成的 2-羟基-3-羧基丁二酸半醛可与氨源或伯胺发生反应,从而避免大量脱羧。