Synthesis of 2,5-dideoxy-2-C-methyl-d-arabinose derivatives from methyl 2,3-anhydro-5-deoxy-α-d-ribofuranoside
作者:Hiroshi Yamamoto、Hiroshi Sasaki、Saburo Inokawa
DOI:10.1016/0008-6215(84)85225-8
日期:1984.9
afforded 3- O -benzyl-2,5-dideoxy-2- C -methyl- d -arabinose diethyl dithioacetal (20%) and ethyl 3- O -benzyl-2,5-dideoxy-2- C -methyl-1-thio-α- d -arabinoside (73%). The former, which was also available from the latter by equilibration in acidic ethanethiol, was acetylated at O-4 and the product converted into the corresponding dimethyl acetal (85% overall yield). This compound was, after debenzylation
摘要用二甲基铜酸锂处理甲基2,3-脱水5-脱氧-α-d-呋喃核糖苷,得到甲基2,5-二脱氧-2-C-甲基-α-d-阿拉伯呋喃糖苷(54%收率)和甲基3 ,5-二脱氧-3-C-甲基-α-d-木呋喃糖苷(10%)。将前者转化为其3-O-乙酰基和3-O-苄基衍生物,其经酸水解后得到3-O-乙酰基和3-O-苄基-2,5-二脱氧-2-C-甲基-d-阿拉伯呋喃糖的总产率为60-75%。在三氟甲磺酸存在下用乙硫醇处理3-O-苄基化合物,得到3-O-苄基-2,5-二脱氧-2-C-甲基-d-阿拉伯糖二乙基二硫缩醛(20%)和乙基3-O -苄基-2,5-二脱氧-2-C-甲基-1-硫代-α-d-阿拉伯糖苷(73%)。前者也可以通过在酸性乙硫醇中平衡而从后者获得,将其在O-4下乙酰化,并将产物转化为相应的二甲基乙缩醛(总产率为85%)。脱苄基后,将该化合物用酸水解,以总产率的70%提供4-O-乙酰基-2,5-二脱氧-2-C-甲基-d-阿拉伯糖。