Cord-factor analogs: Synthesis of 6,6′-di-O-mycoloyl- and -corynomycoloyl-(α-d-mannopyranosyl α-d-mannopyranoside)
作者:Avraham Liav、Mayer B. Goren
DOI:10.1016/0008-6215(84)85304-5
日期:1984.7
-mannopyranosyl α- d -mannopyranoside (7). Removal of the two benzylidene groups from 7, and selective tosylation of the product, gave a mixture of the 6,6′-ditosylate (11) and the 6-monotosylate (12), which were separated by chromatography. Treatment of 11 with potassium corynomycolate or potassium mycolate afforded the corresponding 6,6′-diesters, 14 and 15, respectively. Treatment of the monotosylate
摘要对4,6:4',6'-二-O-亚苄基-α,α-海藻糖进行选择性三氟甲磺酸化,得到4,6:4',6'-二-O-亚苄基-2,2'-di-O -triflyl-α,α-海藻糖,其结构由其3,3'-di-O-乙酰基衍生物(4)的1H-nmr光谱确证。在六甲基磷三酰胺中用亚硝酸钠处理4,然后进行苄化,得到2,3,2',3'-四-O-苄基-4,6:4',6'-二-O-亚苄基-(α- d-甘露吡喃糖基α-d-甘露吡喃糖苷(7)。从7中除去两个亚苄基,并对产物进行选择性甲苯磺酸化,得到6,6'-二甲苯磺酸酯(11)和6-单甲苯磺酸酯(12)的混合物用钴霉素或麦考酸钾处理11分别得到相应的6,6'-二酯14和15。