Transannular Nitrone Cycloaddition. A Stereocontrolled Entry to the Spirocyclic Core of Pinnaic Acid
作者:James D. White、Paul R. Blakemore、Eric A. Korf、Alexandre F. T. Yokochi
DOI:10.1021/ol000361j
日期:2001.2.1
[figure: see text] Thermolysis of lactone 18 initiated a stereospecifictransannular nitrone-olefin [3 + 2] cycloaddition to yield tetracycle 19. Methanolysis followed by reductive cleavage of the isoxazolidine yielded 20, representing the azaspirocyclic core of pinnaic acid (1).