The Total Synthesis of C-Glycosides with Completely Resolved Seven-Carbon Backbone Polyol Stereochemistry: Stereochemical Correlations and Access toL-Configured and Other Rare Carbohydrates
作者:H. Martin R. Hoffmann、Ralf Dunkel、Matthias Mentzel、Henning Reuter、Christian B. W. Stark
DOI:10.1002/1521-3765(20011119)7:22<4771::aid-chem4771>3.0.co;2-j
日期:2001.11.19
novo synthesis of a full set of hydroxymethyl C-glycosides from only two precursors is described. The seven-carbon target molecules contain five stereocentres and bridge the stereochemical gap between natural D-configured and non-natural L-configured series of hexoses. Key steps include hydroxylation, differential protection, stereoselective reduction and desymmetrization of 8-oxabicyclo[3.2.1]oct-6-enes
描述了仅由两种前体从头合成全套羟甲基C-糖苷。七碳目标分子包含五个立体中心,并弥合了天然D构型和非天然L构型系列己糖之间的立体化学间隙。关键步骤包括8-氧杂双环[3.2.1] oct-6-enes的羟基化,差异保护,立体选择性还原和脱对称。七碳多元醇主链的C末端分化和C末端切除导致己糖,包括L系列糖。提出了C-糖苷的立体化学和遗传分类。