Complex tetrahydrofurans from carbohydrate lactones: THF amino acids as building blocks for unnatural biopolymers
作者:Daniel D. Long、Martin D. Smith、Angeles Martín、Joseph R. Wheatley、David G. Watkin、Mattaius Müller、George W. J. Fleet
DOI:10.1039/b111258a
日期:——
The multi-gram syntheses of two epimeric six-carbon tetrahydrofurancarboxylates based upon a D-arabinofuranose template are described. An approach to 3-O-benzyl protected derivatives is also detailed. Introduction of nitrogen at C-6 of these scaffolds leads to the generation of building blocks suitable for the generation of oligomers which possess well defined secondary structures. Radical bromination facilitates introduction of nitrogen at C-2, to afford anomeric α-amino acid derivatives which are elaborated to two unnatural diastereomers of the potent herbicidal natural product hydantocidin. X-Ray crystal structures of N-methyl-2-azido-2-deoxy-α-D-arabino-hex-2-ulofuranosonamide and N-dodecyl-2-azido-2-deoxy-β-D-arabino-hex-2-ulofuranosonamide are also disclosed.
文中介绍了基于 D-阿拉伯呋喃糖模板的两种六碳四氢呋喃羧酸表聚物的多克合成方法。此外,还详细介绍了 3-O-苄基保护衍生物的合成方法。在这些支架的 C-6 处引入氮,可生成适合于生成具有明确二级结构的低聚物的构建模块。自由基溴化促进了 C-2 位氮的引入,从而产生了同分异构的 α-氨基酸衍生物,这些衍生物被详细加工成两种非天然的非对映异构体,即强效除草天然产物 hydantocidin。此外,还披露了 N-甲基-2-叠氮-2-脱氧-α-D-阿拉伯-六-2-呋喃肌苷酰胺和 N-十二烷基-2-叠氮-2-脱氧-β-D-阿拉伯-六-2-呋喃肌苷酰胺的 X 射线晶体结构。