Convergent and Stereoselective Synthesis of Iminosugar-Containing Gal<i>f</i> and UDP-Gal<i>f</i> Mimicks: Evaluation as Inhibitors of UDP-Gal Mutase
作者:Virginie Liautard、Valérie Desvergnes、Kenji Itoh、Hung-wen Liu、Olivier R. Martin
DOI:10.1021/jo8001134
日期:2008.4.1
which afforded the corresponding open-chain product with a 1,2-syn stereochemistry, as predicted from pionneering studies from Kobayashi. Cyclization of these intermediates afforded α-C-glycosides of imino-galactofuranose carrying various functional groups in the aglycone. Further elaboration of the α-C-allyl substituted derivative by cross-metathesis with a uridin-5‘-yl vinylphosphonate provided, after
的合成UDP-Gal的˚F类似物掺入1,4-二脱氧-1,4-亚氨基- d -galactitol骨架α联通过3C-系绳和一系列相关吡咯烷呋喃半乳糖模拟了的被报告的到UMP。这些化合物是通过甲硅烷基化的亲核试剂与N- Cbz葡糖呋喃糖胺的高度立体选择性反应而获得的,N- Cbz葡糖呋喃糖胺提供了1,2-顺式立体化学的相应开链产物,这是从Kobayashi的开创性研究中预测到的。这些中间体,得到α-环化Ç -glycosides亚氨基呋喃半乳糖携带各种官能团中的糖苷配基的。进一步阐述α- C脱保护后,通过与间质5'-乙烯基乙烯基膦酸酯的交叉复分解反应,生成-烯丙基取代的衍生物,得到所需的原始UDP-Gal f缩影。使用BCl 3切割亚氨基糖组分中的苄基醚保护基对合成计划的成功至关重要。几个新的1,4-二去氧-1,4-亚氨基的d -galactitol衍生物评价为从UGM(UDP-吡喃半乳糖变位酶)的抑制剂的大肠杆菌;