6R- and 6S-6C-Methylmannose from d-mannuronolactone. Inhibition of phosphoglucomutase and phosphomannomutase: agents for the study of the primary metabolism of mannose
作者:Angeles Martin、Mark P Watterson、Andrew R Brown、Faiqa Imtiaz、Bryan G Winchester、David J Watkin、George W.J Fleet
DOI:10.1016/s0957-4166(98)00492-3
日期:1999.1
The syntheses of 6S-3 and 6R-6 6C-methylmannoses rely on opposite and highly stereoselective reductions of fully and partially protected ketones derived from d-mannuronolactone, respectively. Reduction of the silylated ketone 2 by sodium borohydride was accompanied by complete migration of the silyl protecting group to the new stereogenic centre; the silyl migration was suppressed when the reduction
6 S - 3和6 R - 6 6 C-甲基甘露糖的合成分别依赖于衍生自d-甘露糖醛酸内酯的完全和部分受保护的酮的相反和高度立体选择性还原。硼氢化钠还原甲硅烷基化的酮2伴随着甲硅烷基保护基团的完全迁移到新的立体异构中心。当在氯化铈(III)存在下进行还原时,甲硅烷基迁移被抑制。两种差向异构体都是磷酸葡萄糖变位酶和磷酸甘露糖突变酶的良好抑制剂,并且是磷酸己糖合酶的特异性抑制剂。这项工作证实了6 C-烷基己糖提供了一组有价值的,具有良好生物利用度的化合物,用于研究与糖磷酸酯的初级代谢有关的酶。-7-脱氧-2,3-的X射线晶体分析:5,6二ö异亚丙基α-L- -glycero- d -manno- heptofuranose 16进行报告。