Efficient procedure for c '- 3 substitution and c - 7 n-acylation of 7-aminocepha-losporanic acid (7-aca): Synthesis of cefazolin antibiotic and related compounds
作者:Alberto Palomo-coll、Antonio L. Palomo Coll、Claudio Palomo Nicolau
DOI:10.1016/s0040-4020(01)96757-2
日期:1985.1
7-aminocepha-losporanic acid (7-ACA), is described. The key feature of our method is based on the protection of the anino group as a Schiff base instead of the usual procedure based on the acylation of the amino group. The relative incapacity of 7-ACA derivatives to produce organic solutions with usual tertiary bases is easily overcome with bicyclic amidines. Catalytic amounts of these bases and N-trimethy
描述了一种新的制备方法,用于C--3取代7-氨基头孢-氯孢烷酸(7-ACA)。我们方法的关键特征是基于保护作为Schiff碱的阴离子基团,而不是基于氨基酰化的常规方法。用双环am很容易克服7-ACA衍生物相对不能生产通常的叔碱的有机溶液的问题。这些碱和N-三甲基甲硅烷基-2-恶唑烷酮的催化量用于获得甲硅烷基化产物。还描述了通过N,N-二甲基氯-亚硫酸盐亚甲基氯化铵(SOCl 2 -DMF)活化敏感的四唑乙酸和在无水条件下制备头孢唑林抗生素。