作者:Nathalie Lunau、Chris Meier
DOI:10.1002/ejoc.201200938
日期:2012.11
A convenient approach to the chemical synthesis of L-altrose (1) and its 6-deoxy derivative 2 has been developed by starting from D-galactose (9) and D-fucose (10), respectively. The 5-epimerization by a Mitsunobu inversion of the open-chain D-hexoses was the key step for these routes. Furthermore, the conversion of 2 into peracetylated TDP-6-deoxy-α-L-altrose (3a) was achieved by the cycloSal approach
通过分别从 D-半乳糖 (9) 和 D-岩藻糖 (10) 开始,开发了一种方便的 L-altrose (1) 及其 6-脱氧衍生物 2 的化学合成方法。开链 D-己糖的 Mitsunobu 反转进行的 5-差向异构化是这些路线的关键步骤。此外,通过 cycloSal 方法实现了 2 到过乙酰化 TDP-6-脱氧-α-L-altrose (3a) 的转化。然而,最终的去乙酰化导致了意想不到的副反应,产生了以前未知的 6-脱氧-α-L-吡喃丙二酮糖 1,3-环磷酸酯 (4)。