Using a stereoselective nitromethane addition and a reductive elimination of an ethoxyethoxyl moiety with NaBH4 as key steps, two optically active pseudo-sugars, pseudo-α-D-glucopyranose and pseudo-β-D-glucopyranose, were synthesized from D-glucuronolactone in favorable overall yield. Furthermore, a biologically active pseudo-aminosugar, validamine, was synthesized via a substitution reaction for an acetoxyl group at the β-position of the nitro group in the nitrocyclitol derivative which was prepared from a synthetic intermediate of pseudo-D-glucopyranose.
通过立体选择性的
硝基甲烷加成和用NaBH4还原消除乙氧基乙氧基官能团作为关键步骤,从
D-葡萄糖醛酸内酯合成了两种光学活性的伪糖,伪-α-
D-葡萄糖吡喃糖和伪-β-
D-葡萄糖吡喃糖,获得了较好的总体产率。此外,通过对由伪-
D-葡萄糖吡喃糖合成中间体制备的硝基
环醇衍
生物中硝基位置β位的乙酰氧基进行取代反应,合成了具有
生物活性的伪
氨基糖
有效胺。