The present invention relates to a process for efficiently producing an optically active 2-bromocarboxylic acid and an optically active 2-sulfonyloxycarboxylic acid, which are important in the production of medicinal compounds and so forth.
An optically active 2-sulfonyloxycarboxylic acid ester is subjected to deprotection under acid conditions to obtain an optically active 2-sulfonyloxycarboxylic acid. A metal bromide is caused to act on the acid to brominate it with configuration inversion at position 2 to thereby produce an optically active 2-bromocarboxylic acid. The resultant optically active 2-bromocarboxylic acid is isolated/purified by subjecting it to a step in which the acid is crystallized and separated as a salt with a base. Thus, an optically active 2-bromocarboxylic acid having a high chemical purity and high optical purity can be produced.
本发明涉及一种高效生产光学活性 2-
溴羧酸和光学活性 2-磺酰氧基
羧酸的工艺,这两种酸在药用化合物等的生产中非常重要。
在酸性条件下对具有光学活性的 2-磺酰氧基
羧酸酯进行脱保护,以获得具有光学活性的 2-磺酰氧基
羧酸。一种
金属
溴化物作用于该酸,使其在第 2 位发生构型反转而被
溴化,从而产生一种光学活性 2-
溴羧酸。分离/提纯所得到的光学活性 2-
溴羧酸的步骤是将酸与碱结晶并分离成盐。这样,就可以制得
化学纯度和光学纯度都很高的光学活性 2-
溴羧酸。