Enantiomerically Pure 2-(Carbamoyloxy)oxiranes and Their Utility in the Synthesis of D- and L-3,6-Dideoxy-3-<i>C</i>-methylhexofuranosides via the Homoaldol Reaction
作者:Dieter Hoppe、Gerhard Tarara、Marcus Wilckens
DOI:10.1055/s-1989-27159
日期:——
As an example of a novel flexible strategy in the rapid enantioselective construction of branched carbohydrate analogues by the homoaldol reaction, the title compounds were synthesized. α-Metalated (E)-2-butenyl N,N-diisopropylcarbamate is added to (S)- or (R)-2-benzyloxypropanal. The homoaldol adducts are epoxidized; methanolysis affords furanosides of branched 3,6-dideoxyaldohexoses, or, hydrolysis yields the furanoses.
作为一种新颖的灵活策略示例,通过同醇脱水反应快速选择性构建支链碳水化合物类似物,合成了标题化合物。将α-金属化的(E)-2-丁烯基N,N-二异丙基氨基甲酸酯添加到(S)-或(R)-2-苄氧基丙醛中。生成的同醇脱水加成物经过环氧化处理;甲醇解获得支链3,6-二脱氧醛六糖的呋喃苷,或水解则得呋喃糖。