Applications of 5-<i>E</i><i>ndo</i>-trigonal Cyclization: Construction of Compounds Relevant to the Synthesis of Prostaglandins and Methyl <i>e</i><i>pi</i>-Jasmonate
作者:Mousumi Sannigrahi、Darrin L. Mayhew、Derrick L. J. Clive
DOI:10.1021/jo982225m
日期:1999.4.1
afford the highly substituted 1,2-oxasiloles 36. Again the major isomer had the ester and O-Si units in an anti relationship. Elaboration of 36 (major isomer) gave the Corey lactone derivative 7. A key intermediate (32) in this second sequence was also prepared in optically pure form by starting with 2-deoxy-D-ribose. Compound 19 was converted into 8, a sequence that constitutes a formal synthesis of methyl
当用锡烷处理时,容易通过简单方法构建的硅烷15经历级联的自由基反应,得到双环1,2-氧杂唑16,其主要异构体具有相对于O-Si单元的酯基。该异构体通过19合成为6,即科里内酯的脱氧衍生物。按照相关顺序,将酮24转化为硅烷35;将其转化为硅烷35。这也经历了自由基级联反应以提供高度取代的1,2-氧杂硅烷基36。再次,主要异构体具有反关系的酯和O-Si单元。精细制备36(主要异构体)得到Corey内酯衍生物7。该第二序列中的关键中间体(32)也通过从2-脱氧-D-核糖开始制备为光学纯形式。将化合物19转化为8,该序列构成(+/-)-表皮茉莉酸甲酯的形式合成。