SnCl4 Promoted Efficient Cleavage of Acetal/Ketal Groups with the Assistance of Water in CH2Cl2
作者:Tao Luo、Tian-Tian Xu、Yang-Fan Guo、Hai Dong
DOI:10.3390/molecules27238258
日期:——
carbohydrates containing acetal/ketal groups with the assistance of water in CH2Cl2 led to deacetalization/deketalization products in almost quantitative yields. In addition, for substrates containing both acetal/ketal and p-methoxylbenzyl groups, we also found that the p-methoxylbenzyl group was selectively cleaved by the use of a catalytic amount of SnCl4, while the acetal/ketal groups remained. Furthermore
缩醛化和脱缩醛是一对常规操作,用于在糖基构建块的合成中保护和脱保护糖苷的 4- 和 6- 羟基。在这项研究中,我们发现在 CH2Cl2 中的水的帮助下,用含有缩醛/缩酮基团的各种碳水化合物处理 SnCl4 导致几乎定量产率的脱缩醛/脱缩酮产物。此外,对于同时含有缩醛/缩酮和对甲氧基苄基的底物,我们还发现使用催化量的 SnCl4 会选择性地裂解对甲氧基苄基,而缩醛/缩酮基团仍然存在。此外,基于此,4,6-亚苄基糖苷可以方便地转化为4,6-OAc或4-OH,6-OAc糖苷。