Reagent Control of a Birch Reduction for the Synthesis of a 2-Deoxyoligosaccharide Possessing a 1,4-Dialkylhydroquinone
作者:Sho Yamaguchi、Hiroshi Tanaka、Takashi Takahashi
DOI:10.1002/ejoc.201500515
日期:2015.8
versatile deprotection method for the synthesis of 2-deoxyoligosaccharides containing a 1,4-dialkylhydroquinone moiety at the anomeric position. The Birch reduction of a 2,6-dideoxy monosaccharide with potassium and 1,3-pentadiene gave the deprotected product without any undesired reduction. The utility of this method was then demonstrated in the Birch reduction of a landomycin E deoxytrisaccharide
我们开发了一种通用的脱保护方法,用于合成在异头位置含有 1,4-二烷基氢醌部分的 2-脱氧寡糖。用钾和 1,3-戊二烯对 2,6-二脱氧单糖进行 Birch 还原得到脱保护的产物,没有任何不希望的还原。该方法的效用随后在兰霉素 E 脱氧三糖的 Birch 还原中得到证明。Pd 催化的氢化导致糖苷键的异构化或裂解。相比之下,基于优化条件的桦木还原,然后用 mCPBA(间氯过氧苯甲酸)处理提供了完全脱保护的脱氧三糖,总产率为 65%。这些结果表明,桦木还原是合成复杂天然糖苷的一种强有力的脱保护方法,