申请人:Nagasawa Hiroshi
公开号:US20090043101A1
公开(公告)日:2009-02-12
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 R
3
and R
4
, 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.
提供一种在温和条件下,步骤少且产生较少工业废料的生产5-氯-2,4-二羟基吡啶的工业优势工艺。该工艺采用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分别表示C1到C6的线性或支链烷基,或具有C1到C6的线性或支链烷基的硅基团,可以相同也可以不同),随后从吡喃衍生物中产生5-氯-2,4-二羟基吡啶(1)。该化合物是一种抑制生物降解酶作用的抗恶性肿瘤药物5-氟尿嘧啶的抑制剂。