A method for synthesizing daunosamine hydrochloride from methyl .alpha.-D-mannopyranoside. The major features of the preparative route involve the formation of a 2-deoxy-3-keto intermediate, whose oxime is reduced with high stereoselectivity to the D-ribo-3-amino compound, followed by a stereospecific step late in the sequence to introduce the terminal C-methyl group with inversion at C-5, to generate the required L-lyxo stereochemistry. The synthesis procedure affords daunosamine hydrochloride in 40% overall yield, with no chromatographic procedures for isolation being required in any of the steps.
一种从甲基α-
D-甘露糖合成多柔胺盐酸盐的方法。制备路线的主要特点是形成2-脱氧-3-酮中间体,其
肟还原具有高立体选择性,形成
D-核糖-3-
氨基化合物,然后在序列的后期进行立体特异性步骤,以倒转C-5上的末端C-甲基基团,生成所需的L-lyxo立体
化学。该合成程序总产率为40%,在任何步骤中都不需要色谱分离程序。