申请人:Ajinomoto Co., Inc.
公开号:US05705671A1
公开(公告)日:1998-01-06
The present invention provides a simple and inexpensive method for producing .alpha.-hydroxy-.beta.-aminocarboxylic acids and their esters. An ester of an N-protected .alpha.-amino acid ester is converted into a .beta.-ketosulfoxide, which is then processed with an acid to give an .alpha.-ketohemimercaptal. Next, this is acylated and then processed with a base to obtain an N-protected .alpha.-acyloxy-.beta.-amino-thioester, which is then saponified to obtain an intended compound. According to the method of the present invention, it is possible to produce .alpha.-hydroxy-.beta.-aminocarboxylic acid derivatives, which are intermediates in producing various HIV protease inhibitors, renin inhibitors and carcinostatics, from a-amino acids. The method comprises reduced reaction steps, the selectivity in the method to give the intended product is high, and the yield of the product obtained is high.
本发明提供了一种简单且廉价的制备α-羟基-β-氨基羧酸及其酯的方法。将N-保护的α-氨基酸酯的酯转化为β-酮磺酰氧,然后用酸处理以得到α-酮半硫醛。接下来,对其进行酰化处理,然后使用碱处理以获得N-保护的α-酰氧基-β-氨基硫酯,最后通过皂化反应得到目标化合物。根据本发明的方法,可以从α-氨基酸制备α-羟基-β-氨基羧酸衍生物,这些衍生物是生产各种HIV蛋白酶抑制剂、肾素抑制剂和抗癌剂的中间体。该方法包含减少的反应步骤,在方法中产生目标产物具有高选择性,且所得产物的收率较高。