在两个温和的条件下(5当量10:10:1 v / v Ac(2)O-AcOH; 10:10:1 v / v / v中的10个当量ZnCl(2)在两个温和的条件下乙酰化几个过苄基的6-脱氧己糖甲基糖苷研究了在70摄氏度下的Ac(2)O-AcOH-TFA)。我们专注于糖构型对环外或环内氧位点激活机制之间竞争的影响。使用TFA方案促进外泌激活机制的乙酰分解没有发现任何作用,该机制可提供1-O-Ac-吡喃糖苷,而与糖的构型无关。相反,它在确定ZnCl(2)促进的乙解中的内-外-产品分布上具有主要作用。
Synthesis of<scp>L</scp>-Altrose and Some Derivatives
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
The role of sugar configuration in the acetolysis of 6-deoxyhexose methyl glycosides
作者:Luigi Cirillo、Annalida Di Nola、Emiliano Bedini、Michelangelo Parrilli
DOI:10.1016/j.carres.2009.08.037
日期:2009.11
equiv ZnCl(2) in 2:1 v/v Ac(2)O-AcOH at 5 degrees C; 10:10:1 v/v/v Ac(2)O-AcOH-TFA at 70 degrees C) was studied. We focused on the effect of sugar configuration on the competitionbetween mechanisms with activation at exocyclic or endocyclic oxygen site. No effect was detected in acetolysis using the TFA protocol promoting an exo-activation mechanism, which affords 1-O-Ac-pyranosides regardless of sugar
在两个温和的条件下(5当量10:10:1 v / v Ac(2)O-AcOH; 10:10:1 v / v / v中的10个当量ZnCl(2)在两个温和的条件下乙酰化几个过苄基的6-脱氧己糖甲基糖苷研究了在70摄氏度下的Ac(2)O-AcOH-TFA)。我们专注于糖构型对环外或环内氧位点激活机制之间竞争的影响。使用TFA方案促进外泌激活机制的乙酰分解没有发现任何作用,该机制可提供1-O-Ac-吡喃糖苷,而与糖的构型无关。相反,它在确定ZnCl(2)促进的乙解中的内-外-产品分布上具有主要作用。