作者:Jocelyne Alais、Serge David
DOI:10.1016/s0008-6215(00)90514-7
日期:1992.6
6-dideoxy-1,2- O -(1-methoxyethylidene)-α- d -glucopyranose ( 15 ). Treatment of 15 with dry acetic acid gave 1,2-di- O -acetyl-3-azido-4- O -benzyl-3,6-dideoxy-β- d -glucopyranose ( 16 , 86% yield) that was an excellent glycosyl donor in the presence of trimethylsilyl triflate, allowing the synthesis of cyclohexyl 2- O -acetyl-3-azido-4- O -benzyl-3,6-dideoxy-β- d -glucopyranoside ( 17 , 90%). O -Deacetylation
摘要3- O-(1-咪唑基)磺酰基-1,2:5,6-二-O-异亚丙基-α-d-葡萄糖呋喃糖与苯甲酸酯的SN 2型反应生成3-O-苯甲酰基-α-d -同素衍生物2,其水解得到5,6-二醇3。将化合物3转化为6-脱氧-6-碘衍生物4,将其用三丁基锡烷还原,然后通过苄氧基甲基化保护位置5,得到3-O-苯甲酰基-5-O-苄氧基甲基-6-脱氧-1, 2-O-异亚丙基-α-d-呋喃呋喃糖(6。6的脱苯甲酰化得到7,(1-咪唑基)磺酰化得到8,叠氮化物置换得到3- azido-5- O-苄氧基甲基-3,6- dideoxy-1 ,2-O-异亚丙基-α-d-葡萄糖呋喃糖(9,85%)。9的乙酰化得到1,2,4-三-O-乙酰基-3-叠氮基-3,6-二脱氧-α,β-d -吡喃葡萄糖(10和11)。将10和11的混合物中的AcO-1与乙酸肼(→12)选择性水解,然后转化为吡喃磺酰氯13,在溴化四丁基铵存在下,用