作者:Tak-Ming Cheung、Derek Horton、Roderick J. Sorenson、Wolfgang Weckerle
DOI:10.1016/s0008-6215(00)80931-3
日期:1978.6
-acetyl derivative 14 ) of the methyl glycoside of the title sugar were prepared in a sequence of high-yielding steps from methyl 3-azido-4,6- O -benzylidene-2,3-di-deoxy-α- d - arabino -hexopyranoside ( 4 ). N -Bromosuccinimide converted 4 into the crystalline 4- O -benzoyl-6-bromide 5 , which was treated with silver fluoride to afford the 5,6-unsaturated glycoside 6 . Catalytic hydrogenation of 6 led
摘要从高产步骤开始,按照以下步骤制备了标题糖的甲基糖苷衍生物(3-乙酰氨基-4-苯甲酸酯12、3-乙酰氨基-4-乙酸酯13和N-乙酰衍生物14)。甲基3-叠氮基-4,6-O-亚苄基-2,3-二-脱氧-α-d-阿拉伯-己基吡喃糖苷(4)。N-溴代琥珀酰亚胺将4转化为结晶4- O-苯甲酰基-6-溴化物5,将其用氟化银处理,得到5,6-不饱和糖苷6。6的催化氢化作用基本上导致了12与5的d-阿拉伯糖异构体7的7:1混合物。可选地,将6脱苯甲酰化为10,然后用氢化铝锂对其进行处理,得到结晶的甲基3-氨基-2,3,6-三苯氧基-α-d-苏-hex-5-烯吡喃糖苷(11)。通过氢还原11(作为其盐),随后进行N-乙酰化,几乎完全提供了甲基β-1-木糖苷13,其C-5净反型。化合物13易于转化为结晶目标化合物14。当尝试用5的3-乙酰氨基类似物(2)用氟化银进行脱氢溴化反应时,得到的是3,6-脱水产物(1),而不是预期的5