Synthesis of new branched-chain aminodeoxyhexoses related to daunosamine (3-amino-2,3,6-trideoxy-l-lyxo-hexose)
作者:Alberto Bargiotti、Giuseppe Cassinelli、Sergio Penco、Aristide Vigevani、Federico Arcamone
DOI:10.1016/s0008-6215(00)81041-1
日期:——
Abstract Addition of methylmagnesium iodide to methyl 2,3,6-trideoxy-3-trifluoro-acetamido-α- l - threo -hexopyranosid-4-ulose (3) gave methyl 2,3,6-trideoxy-4- C -methyl-3-trifluoroacetamido-α- l - lyxo -hexopyranoside (4) and its l - arabino analogue, depending upon the reaction temperature and the solvent. The corresponding 4- O -methyl derivatives were obtained by treatment of 4 and 5 with diazomethane
摘要将甲基碘化镁添加到甲基2,3,6-叔氧基-3-三氟-乙酰氨基-α-1-苏-己基吡喃糖基-4-ulose(3)中,得到甲基2,3,6-叔氧基-4-C-甲基-3-三氟乙酰氨基-α-1-Lyxo-己吡喃糖苷(4)及其1-阿拉伯糖类似物,取决于反应温度和溶剂。在三氟化硼醚化物的存在下,用重氮甲烷处理4和5,得到相应的4-O-甲基衍生物。用亚硫酰氯处理4,然后进行碱处理,得到甲基2,3,4,6-四脱氧-4-C-亚甲基-3-三氟-乙酰氨基-α-1-苏氨酸-己吡喃糖苷(8) ,其被立体选择性地还原为甲基2,3,4,6-四脱氧-4-C-甲基-3-三氟乙酰氨基-α-1-阿糖基-己吡喃糖苷。8用3-氯过氧苯甲酸环氧化得到相应的4,4 1-脱水-4-C-羟甲基-1- lyxo衍生物(10),其也通过用重氮甲烷处理3来制备。10的叠氮化,然后催化氢化和N-三氟乙酰化,得到甲基2,3,6-三苯氧基-3-三氟乙酰