Process for the preparation of a (D-alpha-amino-(p-hydroxyphenyl)-acetamido) group containing cephalosporanic acid derivatives
申请人:GIST-BROCADES N.V.
公开号:EP0019345A1
公开(公告)日:1980-11-26
Process for the preparation of [D-a-amino-(p- hydroxyphenyl)acetamido] groups containing cephalosporanic acid derivatives, comprising the acylation of a compound of the formulae:
wherein R,, R2 and R3 representthe same or a different group and may be selected from a lower alkyl, benzyl, cycloalkyl or. phenyl-group and preferably lower alkyl and more preferably a methyl group an wherein X represents a residue selected from the group consisting of hydrogen, acetoxy or a five-membered heterocyclic thio residue, containing heteroatoms selected from nitrogen, oxygen, and/or sulphur and optionally substituted by lower alkyl and wherein an eventually present -NH- radical has optionally been silylated, which compound is previously prepared by the reaction of 7-aminocephalosporanic acid or its 3-methyl modifications with at least one equivalent and preferably about two with respect to other 3-methyl modifications of 7-ACA of a tri(lower)alkyl silyl groups supplying agent in a dry, inert, water insoluble solvent, such as methylene chloride, by rapid mixing of a pre-cooled solution of the compound offormulae I and Il with a pre-cooled reaction mixture of at least an equimolecular amount of a compound of the formula
wherein R4 represents lower alkyl and preferably methyl,
R5 represents hydrogen or lower alkyl and preferably methyl,
R6 represents lower alkoxy and preferably methoxy,
and R7 represents lower alkoxy and preferably methoxy, previously prepared from the corresponding Dane salt and an acid chloride under anhydrous conditions in the presence of a tertiary amine as catalyst, such as N-methylmorpholine in a dry, inert, water insoluble, organic solvent such as methylene chloride mixed with a co-solvent or methyl isobutylketone or tetrahydrofuran optionally mixed with a co-solvent, and the continuation of the reaction at a temperature of -10°C or lower and preferably from -20°C to -30°C whereafter the desired compound is recovered by usual methods.
制备含有头孢菌素衍生物的[D-a-氨基-(对羟基苯基)乙酰氨基]基团的工艺,包括将式中的化合物酰化:
其中 R、R2 和 R3 代表相同或不同的基团,可选自低级烷基、苄基、环烷基或。其中 X 代表选自氢、乙酰氧基或五元杂环硫基残基组成的组的残基,该残基含有选自氮、氧和/或硫的杂原子,并任选被低级烷基取代,其中最终存在的-NH-基任选被硅烷化、该化合物的制备方法是:在干燥、惰性、不溶于水的溶剂(如二氯甲烷)中,将 7-氨基头孢烷酸或其 3-甲基修饰物与至少一个当量,最好是约两个当量的 7-ACA 的其他 3-甲基修饰物的三(低级)烷基硅烷基团供给剂反应,将式 I 和 Il 所示化合物的预冷溶液与至少等分子量的式化合物的预冷反应混合物迅速混合
其中 R4 代表低级烷基,最好是甲基、
R5 代表氢或低级烷基,最好是甲基、
R6 代表低级烷氧基,最好是甲氧基、
和 R7 代表低级烷氧基,最好是甲氧基,以前是在无水条件下,以叔胺为催化剂,如 N-甲基吗啉为催化剂,在干燥、惰性、不溶于水的有机溶剂如二氯甲烷中,从相应的 Dane 盐和酰氯中制备的、在干燥、惰性、不溶于水的有机溶剂如二氯甲烷与助溶剂混合,或甲基异丁基酮或四氢呋喃与助溶剂混合的情况下,在-10℃或更低的温度下,最好在-20℃至-30℃的温度下继续反应,然后用通常的方法回收所需的化合物。