申请人:BLASCHIM S.p.A.
公开号:EP0302541A2
公开(公告)日:1989-02-08
A method of preparing ethodolac by reacting furan with a reactive derivative of propionic acid, reacting 2-propionyl furan with an ester of a haloacetic acid oxidising an ester of 3-hydroxy-3(2'-furyl)-pentanoic acid protecting the hydroxy group of the resulting pyran derivative and hydrogenolysis and reduction therof, condensation of 5,6-dihydro-2-ethyl-2-carboxymethyl-2H-pyran(4H)-one or an ester thereof with 2-ethylphenylhydrazine and finally, when the resulting product is an ester, hydrolysis thereof.
一种制备乙多拉克的方法,通过使呋喃与丙酸的活性衍生物反应,使 2-丙酰基呋喃与卤乙酸的酯反应,氧化 3-羟基-3(2'-呋喃基)-戊酸的酯,保护所得吡喃衍生物的羟基,并对其进行氢解和还原、5,6-二氢-2-乙基-2-羧甲基-2H-吡喃(4H)-酮或其酯与 2-乙基苯肼缩合,最后,当所得产物为酯时,将其水解。