An Improved Protocol for the Stereoselective Synthesis of β-<scp>d</scp>-Glycosyl Fluorides from 2-<i>O</i>-Acyl Thioglycosides
作者:Nicholas W. See、Xiaowen Xu、Vito Ferro
DOI:10.1021/acs.joc.2c01748
日期:2022.11.4
presented. We demonstrate that a precise combination of XtalFluor-M, N-bromosuccinimide, and Et3N·3HF can mediate facile, high-yielding, and diastereoselective conversions of 2-O-acyl thioglycosides to β-d- and other 1,2-trans glycosyl fluorides. The key roles of these reagents are dissected in this work, as is the impact of their interplay on the fluorination stereoselectivity.
介绍了一种用于制备 β- d-糖基氟化物的安全且操作简单的方案。我们证明了 XtalFluor-M、N-溴代琥珀酰亚胺和 Et 3 N·3HF 的精确组合可以介导 2- O-酰基硫苷到 β- d-和其他 1,2-的简便、高产和非对映选择性转化反式糖基氟化物。在这项工作中剖析了这些试剂的关键作用,以及它们的相互作用对氟化立体选择性的影响。