Enantioselective synthesis of erythro-4-deoxyglycals as scaffolds for target- and diversity-oriented synthesis: new insights into glycal reactivity
作者:Sirkka B. Moilanen、Derek S. Tan
DOI:10.1039/b417429a
日期:——
An efficient, enantioselective synthesis of erythro-4-deoxyglycals has been developed using asymmetric aldehyde allylation and tungsten-catalyzed alkynol endo-cycloisomerization as the key steps. These versatile synthetic scaffolds have been elaborated to a variety of products using stereoselective transformations that are complementary to those available using the corresponding threo glycals. This work has provided valuable insights into the relationships between glycal structure and reactivity. In addition, a new diene-forming side reaction during tungsten-catalyzed alkynol cycloisomerization has been discovered.
以不对称醛类烯丙基化和钨催化的炔醇内型环化反应为关键步骤,已开发出一种高效、对映选择性红-4-脱氧糖醛合成方法。这些多功能合成骨架已经通过立体选择性转化被开发为各种产品,与使用相应的外型糖醛的转化方法互为补充。这项工作为糖醛结构与反应性之间的关系提供了宝贵的见解。此外,在钨催化的炔醇环化反应中,还发现了一种新的二烯形成副反应。