申请人:Nikken Chemicals Co., Ltd.
公开号:US03966720A1
公开(公告)日:1976-06-29
A process for producing a desacetoxy cephalosporanic acid represented by formula (III), ##SPC1## wherein R.sub.1 is acyl, and R.sub.2 is alkyl, aryl or arylalkyl, which comprises: heating a penicillin sulfoxide of the formula (I), ##SPC2## wherein R.sub.1 and R.sub.2 are the same as hereinbefore defined at 50.degree. to 160.degree.C in an inert organic solvent in the presence of a sulfonate represented by formula (II), ##EQU1## wherein A is R.sub.5 --N--R.sub.6, R.sub.5 --N--O--R.sub.6, S--R.sub.6, R.sub.5 --S.fwdarw.O, and R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are lower alkyl, phenyl, benzyl or phenethyl, R.sub.7 is 1-12C alkyl, phenyl, 1-12C alkyl-substituted-phenyl, naphthyl, 1-12C alkyl-substituted naphthyl, halogen-substituted phenyl and wherein when A is R.sub.5 --N--R.sub.6 or R.sub.5 --N--O--R.sub.6, R.sub.3, R.sub.4 and R.sub.5 may form a heterocyclic ring together with the nitrogen atom, and when A is S--R.sub.6, R.sub.3 and R.sub.4 may form a heterocyclic 4-5C polymethylene ring or R.sub.6 and R.sub.7 may bond to form a polymethylene link.
生产一种由公式(III)表示的去乙酰头孢菌素酸的方法,其中R1为酰基,R2为烷基、芳基或芳基烷基,包括:在惰性有机溶剂中,在公式(I)表示的青霉素亚砜中加热,其中R1和R2如前所定义,温度为50°C至160°C,在公式(II)表示的磺酸盐的存在下进行,其中A为R5-N-R6,R5-N-O-R6,S-R6,R5-SO,R3,R4,R5和R6为较低的烷基,苯基,苄基或苯乙基,R7为1-12碳原子的烷基,苯基,1-12碳原子取代的苯基,萘基,1-12碳原子取代的萘基,卤代取代的苯基,其中当A为R5-N-R6或R5-N-O-R6时,R3,R4和R5可以与氮原子一起形成杂环,当A为S-R6时,R3和R4可以形成含氮原子的杂环4-5C聚亚甲基环或R6和R7可以结合形成聚亚甲基链。