A preparative synthesis of 3-amino-2,3,6-trideoxy-l-lyxo-hexose (daunosamine) hydrochloride from d-mannose
作者:Derek Horton、Wolfgang Weckerle
DOI:10.1016/s0008-6215(00)84166-x
日期:1975.11
4-O-benzoyl-6-bromide 7. Dehydrohalogenation of gives the 5,6-unsaturated glycoside 8, which, after O-debenzoylation to 9, undergoes stereospecific reduction by hydrogen with net C-5 inversion to give the crystalline, N-acetylated methyl beta-glycoside (10) of daunosamine, readily converted into daunosamine hydrochloride (11) and into the crystalline N-benzoyl (14) and N-acetyl(15) derivatives. No chromatographic
描述了一种简单的,从甲基α-D-甘露吡喃糖苷(1)开始的九步制备方法,该方法以40%的总收率提供了标题氨基糖11,即抗肿瘤抗生素阿霉素和柔红霉素的糖成分。1的2,3:4,5-二亚苄基乙缩醛(2)被丁基锂转化为2-脱氧-3-酮3,其肟4以对D-核糖胺高的立体选择性还原为N -乙酰基衍生物5并通过N-溴琥珀酰亚胺的作用转化为4-O-苯甲酰基-6-溴化物7。的脱卤化氢得到5,6-不饱和糖苷8,在O-脱苯甲酰化为9后,通过氢与C-5净转化,得到柔红霉素的结晶N-乙酰化甲基β-糖苷(10),易转化为盐酸柔红胺(11)和结晶的N-苯甲酰基(14)和N-乙酰基(15)衍生物。在任何步骤中都不需要分离的色谱程序。