Syntheses of methylated catechins and theaflavins using 2-nitrobenzenesulfonyl group to protect and deactivate phenol
作者:Tomohiro Asakawa、Yusuke Kawabe、Atsushi Yoshida、Yoshiyuki Aihara、Tamiko Manabe、Yoshitsugu Hirose、Asuka Sakurada、Makoto Inai、Yoshitaka Hamashima、Takumi Furuta、Toshiyuki Wakimoto、Toshiyuki Kan
DOI:10.1038/ja.2016.14
日期:2016.4
An efficient and versatile synthetic method for labile polyphenols was established using 2-nitrobenzenesulfonate (Ns) as a protecting group for phenol. This methodology provides regio- and stereoselective access to a range of methylated catechins, such as methylated epigallocatechin gallates, that are not readily available from natural sources. In addition, biomimetic synthesis of theaflavins from
使用2-硝基苯磺酸盐(Ns)作为酚的保护基,建立了一种有效且通用的不稳定多酚合成方法。这种方法为区域和立体选择提供了一系列甲基化的儿茶素,例如甲基化的表没食子儿茶素没食子酸酯,而天然来源不易获得。此外,使用Ns保护可从儿茶素仿生合成茶黄素,从而最大程度地减少了氧化过程中富电子芳环的不良副反应,从而能够在一步氧化偶联反应中构建复杂的苯并马酚酮核。这些化合物的可用性将有助于儿茶素的详细结构生物学活性关系研究。