Nouvelle méthode de synthèse Stéréosélective de glycosides. Syntèse des α,α-tréhalose, analogues galacto, manno et autres α-d-glycosides
作者:André A. Pavia、Jean-Michel Rocheville、Sak N. Ung
DOI:10.1016/s0008-6215(00)85133-2
日期:1980.2
corresponding α,α-(1 → 1) and α,β-(1 → 1) disaccharides. Hence, pure 2,3,4,6,2′,3′,4′,6 - octa-O-benzyl derivatives of α,α-trehalose, and the d -galacto and d -manno analogues were obtained, after column chromatography, in 55–65% yield. Hydrogenolysis gave the corresponding free sugars. The pure anomers were obtained in 10–34% yield. The potentiality of the method was demonstrated by the synthesis of 2,3
摘要在三氟甲磺酸(三氟甲磺酸)酐为催化剂,二氯甲烷为溶剂的情况下,在低温下存在2,3,4,6-四-O-苄基-d-吡喃葡萄糖,2,3,4,6-四-O -苄基-d-吡喃半乳糖和2,3,4,6-四-O-苄基-d-甘露吡喃糖几乎定量地转化为相应的α,α-(1→1)和2:1混合物α,β-(1→1)二糖。因此,在柱后,获得了α,α-海藻糖的纯2,3,4,6,2',3',4',6-辛基-O-苄基衍生物,以及d-半乳糖和d-甘露糖类似物。层析,产率55-65%。氢解得到相应的游离糖。以10–34%的产率获得纯的异头物。该方法的潜力通过合成2,3,4,6-四-O-苄基-α-d-吡喃葡萄糖基2,3:4,5-二-O-异亚丙基-β-d-果糖吡喃糖苷来证明。 50%的产量,