Stereoselective 2-Deoxy-β-O-glycoside Synthesis Based on Remote Activation of Novel Oxathiine Donors
作者:Alessandra Bartolozzi、Giuseppe Capozzi、Stefano Menichetti、Cristina Nativi
DOI:10.1002/1099-0690(200106)2001:11<2083::aid-ejoc2083>3.0.co;2-t
日期:2001.6
1-glycals and 3-thioxopentane-2,4-dione, have been transformed into unusual glycosyl donors which, after “remote activation”, react efficiently with glycosyl acceptors to afford 2-thio-β-O-glycosides with total stereoselectivity. Several O-nucleophiles were successfully glycosylated. Reductive removal of sulfur transformed the 2-thio-β-O-glycosides into the corresponding 2-deoxy-β-O-glycosides without affecting
通过合适的 1-glycals 和 3-thioxopentane-2,4-dione 之间的逆电子需求 Diels-Alder 反应制备的稳定的糖融合 1,4-oxathiine 衍生物已转化为不寻常的糖基供体,在“远程激活后” ”,与糖基受体有效反应以提供具有总立体选择性的 2-硫代-β-O-糖苷。几个O-亲核试剂被成功地糖基化。硫的还原去除将 2-硫代-β-O-糖苷转化为相应的 2-脱氧-β-O-糖苷,而不影响异头碳原子的立体化学。