Studies on tumor promoters. 11. A new [5+2] cycloaddition method and its application to the synthesis of BC ring precursors of phorboids
摘要:
A new method for the generation of oxidopyrylium zwitterions has been developed that allows for its use in the [5 + 2] cycloaddition of substrates incorporating thermally unstable functionalities, providing for the synthesis of previously inaccessible precursors to tiglianes, daphnanes, and ingenanes.
Studies on tumor promoters. 11. A new [5+2] cycloaddition method and its application to the synthesis of BC ring precursors of phorboids
摘要:
A new method for the generation of oxidopyrylium zwitterions has been developed that allows for its use in the [5 + 2] cycloaddition of substrates incorporating thermally unstable functionalities, providing for the synthesis of previously inaccessible precursors to tiglianes, daphnanes, and ingenanes.
Formation of Polycyclic Lactones through a Ruthenium-Catalyzed Ring-Closing Metathesis/Hetero-Pauson–Khand Reaction Sequence
作者:David F. Finnegan、Marc L. Snapper
DOI:10.1021/jo200359c
日期:2011.5.20
form multiplecarbon–carbonbonds in one operation can generate molecular complexity quickly and therefore be used to shorten syntheses of desirable molecules. We selected the hetero-Pauson–Khand (HPK) cycloaddition and ring-closing metathesis (RCM) as two unique carbon–carbon bond-forming reactions that could be united in a tandem ruthenium-catalyzed process. In doing so, complex polycyclic products