Partial structures of peptidoglycan, a potent immunostimulating glycoconjugate of bacteria, were synthesized for precise biological studies. A key disaccharide glucosaminyl-β(1–4)-muramic acid was prepared by stereoselective glycosylation of a N-Troc (Troc=2,2,2-trichloroethoxycarbonyl) muramic acid acceptor with a N-Troc-glucosaminyl trichloroacetimidate. The disaccharide was converted to either a
合成了肽聚糖的部分结构,一种有效的细菌免疫刺激糖缀合物,用于精确的
生物学研究。通过将N -Troc(Troc = 2,2,2-三
氯乙氧基羰基)村酸受体与N -Troc-
氨基葡萄糖氨基三
氯乙酰胺酸酯进行立体选择性糖基化反应,制备了关键的二糖
氨基葡萄糖氨基β-(1-4)-
氨基
乙酸。将二糖转化为二糖受体或供体。然后通过相同的糖基化方法将它们偶联在一起,以高收率得到四糖。以相似的方式也以高收率获得了八糖。ñ-乙酰化并与1-丙
氨酰-d-异谷
氨酰胺的二肽部分偶联,然后脱保护,首次得到了重复的肽聚糖四糖和十八肽肽缀合物。