Regio- and Chemoselective One-Step
3-O-Alkylenation of Unprotected Ascorbic Acid Using ω-Iodoalkanols
作者:Bang Luu、Thierry Muller、Paul Heuschling
DOI:10.1055/s-0028-1087662
日期:——
A regio- and chemoselective alkylenation employing unprotected ascorbic acid and a series of unprotected iodoalkanols in the presence of sodium hydrogen carbonate in dimethyl sulfoxide is described. This atom economic high yielding procedure delivers the corresponding 3-O-alkylene ethers in a single step without prior protection. Specific 3-O-etherification was also observed with unprotected 16-iodohexadecanoic acid and with 2-(10-iododecyl)isoindole-1,3-dione. Furthermore, an 2-O-alkylene derivative was obtained when 3-O-benzyl ascorbic acid was reacted with unprotected 10-iododecanol under slightly modified conditions. Finally, the antioxidative activity of all compounds was determined and compared to vitamin C and E.
描述了一种使用未保护的抗坏血酸和一系列未保护的碘烷醇,在碳酸氢钠存在下于二甲基亚砜中进行的区域和化学选择性烷基化。这种原子经济、高产率的程序在无需事先保护的情况下,单步合成了相应的3-O-烷基醚。同时,未保护的16-碘十六酸和2-(10-碘十烷基)异吲哚-1,3-二酮也观察到了特定的3-O-醚化。此外,当3-O-苄基抗坏血酸与未保护的10-碘癸醇在稍微修改的条件下反应时,获得了一个2-O-烷基衍生物。最后,所有化合物的抗氧化活性被测定并与维生素C和E进行了比较。