申请人:Taiho Pharmaceutical Co., Ltd.
公开号:US07557216B2
公开(公告)日:2009-07-07
To provide an industrially advantageous process for producing 5-chloro-2,4-dihydroxypyridine, which is an inhibitor acting on a biodegradation enzyme that biodegrades an anti-malignant-tumor agent 5-fluorouracil. The process is carried out under mild conditions with a small number of steps and produces less industrial waste.
The process employs a 5-chloro-1,3-dioxin-4-one derivative (2) as a starting substance to thereby form a pyrone derivative (4) represented by formula (4):
(wherein R3 and R4, which are identical to or different from each other, each represent a C1 to C6 linear-chain or branched-chain alkyl group, or a silyl group having a C1 to C6 linear-chain or branched-chain alkyl group), and subsequently, 5-chloro-2,4-dihydroxypyridine (1) is produced from the pyron derivative.
提供一种工业上优越的方法,用于生产5-氯-2,4-二羟基吡啶,该物质是一种抑制生物降解酶作用的抑制剂,该酶可以降解一种抗恶性肿瘤药物5-氟尿嘧啶。该方法在温和条件下进行,步骤少,产生的工业废物较少。该方法采用5-氯-1,3-二氧杂环戊-4-酮衍生物(2)作为起始物质,从而形成由式(4)表示的吡喃衍生物(4):(其中R3和R4相同或不同,分别表示C1到C6的直链或支链烷基,或具有C1到C6的直链或支链烷基的硅基),随后,从吡喃衍生物中产生5-氯-2,4-二羟基吡啶(1)。