申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0441371A1
公开(公告)日:1991-08-14
Process for preparing haloketo acid derivatives [I]:
wherein R is H or C₁₋₆ alkyl, and X is a chlorine or bromine, which comprises reacting β-oxo-acid ester [II]:
wherein R¹ is C₁₋₆ alkyl, R² is C₁₋₅ alkyl or OR³ (R³ is C₁₋₆ alkyl), and X is the same as above, with nitrosating agent [IV]:
ONOR⁴ [IV]
wherein R⁴ is H, alkyl, halogen or SO₃H to give 7-halo-2-hydroxyiminoheptanoic acid ester [III]:
wherein R¹ and X are the same as above, followed by reacting the product with aldehyde or ketone; and intermediates therefor, and process for preparing said intermediates. Said haloketo acid derivatives are useful as intermediate for synthesis of cilastatin, which is useful as medicament, especially as dehydropeptidase inhibitor.
卤酮酸衍生物的制备工艺 [I]:
其中 R 是 H 或 C₁₋₆烷基,X 是氯或溴,包括使 β-氧代酸酯[II]反应:
其中 R¹ 是 C₁₋₆烷基,R² 是 C₁₋₅烷基或 OR³(R³ 是 C₁₋₆烷基),X 同上:
ONOR⁴ [IV].
其中 R⁴ 是 H、烷基、卤素或 SO₃H,得到 7-卤代-2-羟基亚氨基庚酸酯 [III]:
其中 R¹ 和 X 与上述相同,然后将产物与醛或酮反应;及其中间体,以及制备上述中间体的工艺。上述卤酮酸衍生物可用作合成西司他丁的中间体,西司他丁可用作药物,特别是脱氢肽酶抑制剂。