作者:Nicole Buschmann、Anke Rückert、Siegfried Blechert
DOI:10.1021/jo025589u
日期:2002.6.1
A new enantioselective synthesis of the idolizidine alkaloid (-)-swainsonine 1 in 40% overall yield starting from the known oxazolidinone 6 is described. Throughout the synthesis, the high efficiency of metal-catalyzed reactions is illustrated. The key step is a new ruthenium-catalyzed metathesis rearrangement reaction. In this ring-closing/ring-opening tandem process, stereocenters are transferred
描述了从已知的恶唑烷二酮6开始以40%的总收率合成的新的对映体生物碱(-)-swainsonine 1的对映选择性合成。在整个合成过程中,说明了金属催化反应的高效率。关键步骤是新的钌催化的复分解重排反应。在这种开环/开环串联过程中,立体中心从环转移到所形成的杂环的烯烃侧链上。复分解前体通过钯催化的环戊二醇的脱对称化而获得。合成通过末端双键的官能化,第二个环的环化和非对映选择性二羟基化完成。