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.
Function-Oriented Synthesis: Studies Aimed at the Synthesis and Mode of Action of 1α-Alkyldaphnane Analogues
作者:Paul A. Wender、Noel D'Angelo、Vassil I. Elitzin、Martin Ernst、Eileen E. Jackson-Ugueto、John A. Kowalski、Sharon McKendry、Markus Rehfeuter、Robert Sun、David Voigtlaender
DOI:10.1021/ol0705649
日期:2007.4.1
[reaction: see text] An efficient synthetic route to the ABC tricyclic core of 1alpha-alkyldaphnanes has been developed. The conformational bias imparted by the C6-C9 oxo-bridge of BC-ring system 12 was used to elaborate the ABC-ring system precursor including the introduction of the beta-C5 hydroxyl group. A completely diastereoselective palladium-catalyzed enyne cyclization was then employed to establish
Studies on tumor promoters. 11. A new [5+2] cycloaddition method and its application to the synthesis of BC ring precursors of phorboids
作者:Paul A. Wender、Jose L. Mascarenas
DOI:10.1021/jo00022a009
日期:1991.10
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.