A Stereoselective Synthesis of Nonracemic (+)-Desoxoprosophylline by a Tandem Wittig [2+3]-Cycloaddition Reaction
作者:Claus Herdeis、Joachim Telser
DOI:10.1002/(sici)1099-0690(199906)1999:6<1407::aid-ejoc1407>3.0.co;2-t
日期:1999.6
L-Ascorbic acid serves as chiral starting material for the synthesis of (+)-desoxoprosophylline. The synthetic pathway includes the formation of an O-protected 5-azido-2,3-dideoxysugar which is subjected to a tandem Wittig [2+3]-cycloaddition reaction, leading to the heterocyclic core unit of (+)-prosophylline. Stereoselective hydrogenation and chain elongation yields the desired alkaloid.
L-抗坏血酸用作合成 (+)-desoxoprosophylline 的手性原料。合成途径包括形成 O-保护的 5-叠氮基-2,3-双脱氧糖,该糖经过串联 Wittig [2+3]-环加成反应,生成 (+)-prosophylline 的杂环核心单元。立体选择性氢化和链延长产生所需的生物碱。