Synthesis of 3,6-dideoxy-3-(methylamino)hexoses for G.L.C.-M.S. identification of Rhizobium lipopolysaccharide components
作者:Rawle I. Hollingsworth、Estelle M. Hrabak、Frank B. Dazzo
DOI:10.1016/s0008-6215(00)90026-0
日期:1986.10
synthetic route from methyl alpha-D-glucopyranoside to 3,6-dideoxy-3-(methylamino)hexoses having the D-gluco, D-galacto, and D-manno configurations has been developed. Methyl alpha-D-glucoside was converted into the 4,6-O-benzylidene-2,3-di-O-tosyl derivative, which was then transformed into the 4-O-benzyl-6-deoxy 2,3-ditosylate (5) by successive reductive cleavage of the acetal ring, iodination, and reduction
已经开发了从甲基α-D-吡喃葡萄糖苷到具有D-葡萄糖,D-半乳糖和D-甘露聚糖构型的3,6-二脱氧-3-(甲基氨基)己糖的直接合成路线。将甲基α-D-葡萄糖苷转化为4,6-O-亚苄基-2,3-二-O-甲苯磺酰基衍生物,然后将其转化为4-O-苄基-6-脱氧2,3-二甲苯磺酸酯( 5)通过连续还原性切割乙缩醛环,碘化和还原。中间体5很容易转化为同素的2,3-环氧化物,通过裂解该产物得到关键的中间体甲基4-O-苄基-3,6-二脱氧-3-(甲基氨基)-α-D-吡喃葡萄糖苷(7)。与甲胺的环氧乙烷环。可以通过分别在C-4和C-2处进行选择性转化,将氨基化合物7直接转化为衍生的半乳酸酯和甘露糖衍生物以进行质谱鉴定。