Highly Selective Primary Alkoxycarboxylation and Esterification of Unprotected Pyranose Derivatives Mediated by Scandium(III) Triflate Catalysis
作者:Michael S. McClure、Malcolm B. Berry、Darren Caine、Claire Crawford、Brian C. Crump、Bobby N. Glover、Sandeep B. Kedia、Alan Millar、Mark B. Mitchell、Christopher J. Nichols、Daniel E. Patterson、Jeremiah Powers
DOI:10.1002/ejoc.201200261
日期:2012.7
A highly selective method for the alkoxycarboxylation and acylation of primary alcohols of pyranose derivatives is described. The reaction is high yielding and proceeds under mild conditions with 0.15–1 mol-% Sc(OTf)3 used in combination with anhydrides or pyrocarbonates at 40–50 °C. Selectivities observed for alkoxycarboxylation of unprotected pyranose derivatives are > 95 %, and this constitutes
描述了一种用于吡喃糖衍生物的伯醇的烷氧基羧化和酰化的高选择性方法。该反应产率高,在温和条件下进行,0.15-1 mol-% Sc(OTf)3 与酸酐或焦碳酸盐结合使用,温度为 40-50 °C。观察到的未保护吡喃糖衍生物的烷氧基羧化选择性 > 95%,这构成了优于现有方法的显着优势。还讨论了机械影响,包括空间需求和金属-杂原子配位的作用。