A New Short and Efficient Route to 3-Deoxy-<scp>d</scp>-<i>manno</i>-oct-2-ulosonic Acid (KDO) and 3-Deoxy-<scp>d</scp>-<i>arabino</i>-hept-2-ulosonic Acid (DAH)
作者:Richard Plantier-Royon、Charles Portella、Vincent Kikelj
DOI:10.1055/s-2006-926375
日期:——
An efficient synthesis of lactones 5 and 6, known intermediates towards KDO and DAH, respectively, has been achieved by a short and highly efficient route. Homologation of protected D-mannose and D-arabinose was performed by a Peterson reaction with 2-lithio-2-trimethylsilyldithiane or the corresponding bis(methylsulfanyl) derivative, followed by the cyclization of the resulting ketene dithioacetal
内酯 5 和 6 的有效合成,分别是 KDO 和 DAH 的已知中间体,已通过一条短而高效的路线实现。受保护的 D-甘露糖和 D-阿拉伯糖的同系化是通过与 2-锂硫-2-三甲基甲硅烷基二噻烷或相应的双(甲硫基)衍生物的彼得森反应进行的,然后在非常平稳的条件下环化得到的乙烯酮二硫缩醛。用碘进行氧化处理以高产率的三步顺序得到内酯 5 和 6。有趣的是,这种方法可以被认为是合成各种 2-脱氧糖内酯的通用方法。