Stereoselective synthesis of α-linked 2-deoxysaccharides and furanosaccharides by use of 2-deoxy 2-pyridyl-1-thio pyrano- and furanosides as donors and methyl iodide as an activator
作者:Hari Babu Mereyala、Vinayak R Kulkarni、D Ravi、GVM Sharma、B Venkateswara Rao、G Bapu Reddy
DOI:10.1016/s0040-4020(01)89016-5
日期:——
A practical and highly stereoselective glycosidation methodology is described, where anomeric mixture of 2-deoxy 2-pyridyl-1-thiopyranoside donors (1–3, 27) have been coupled with several sugar alcohols (4–8,29,31) on activation by methyl iodide to obtain axially linked 2-deoxysaccharides (9–17,30,32,33). Application of this method for the synthesis of disaccharide fragment 28 of avermectin is also
一种实用的和高立体选择性糖苷化的方法进行了说明,其中2-脱氧-2-吡啶基-1- thiopyranoside供体(的端基异构混合物1-3,27)已经被加上几个糖醇(4-8,29,31)上激活通过甲基碘获得轴向连接的2-脱氧糖(9–17,30,32,33)。还描述了该方法在合成阿维菌素的二糖片段28中的应用。通过使用2-吡啶基-1-硫呋喃糖苷(34-36)作为供体来制备α-连接的呋喃糖苷(42-51),也显示了该方法的实用性。