Synthesis of 2-Substituted Polyhydroxytetrahydropyrimidines (<i>N</i>-Hydroxy Cyclic Guanidino-Sugars): Transition-State Mimics of Enzymatic Glycosidic Cleavage
作者:Van-Duc Le、Chi-Huey Wong
DOI:10.1021/jo9915574
日期:2000.4.1
The synthesis of 2'-substituted polyhydroxytetrahydropyrimidines as transition-state mimics of enzymatic glycosidic cleavage has been achieved by using guanylation and cyclization methodologies. The D-galacto type N-hydroxy cyclic guanidino-sugar 21 was synthesized in six steps from amine 7 and thiourea 14 in an overall yield of 59%. To further derivatize compound 21 to incorporate the leaving group
通过使用鸟苷酸化和环化方法已经实现了2'-取代的多羟基四氢嘧啶的合成,作为酶促糖苷裂解的过渡态模拟物。由胺7和硫脲14经六步合成D-半乳糖型N-羟基环状胍基糖21,总产率为59%。为了进一步衍生化化合物21以结合离去基团部分,我们合成了2-甲基硫烷基化合物26-29作为关键中间体。用胺置换胺中的2-甲基硫烷基(29)中的2-甲基硫烷基,以路易斯酸的形式,以中等收率(60-67%)得到被保护的环状胍30-32。除去32中的保护基,得到D-半乳糖型N-羟基环状胍基糖34。