Zwitterionic Sulfobetaine Inhibitors of Squalene Synthase
作者:Thomas A. Spencer、Thomas J. Onofrey、Reginald O. Cann、Jonathon S. Russel、Laura E. Lee、Daniel E. Blanchard、Alfredo Castro、Peide Gu、Guojian Jiang、Ishaiahu Shechter
DOI:10.1021/jo981617q
日期:1999.2.1
A substantial number of sulfobetaines (e.g., 10) have been synthesized and evaluated as inhibitors of squalenesynthase (SS) on the basis of the idea that their zwitterionic structure would have properties conducive both to binding in the active site and to passage through cell membranes. When the simple sulfobetaine moiety is incorporated into compounds containing hydrophobic portions like those in
farnesol to (±)-sesquicarene (1) involving intramolecular carbenoid cycliziation of acyclic precursors as the key step are described. The diazoketone (4) derived from 2,6,10-trimethylundeca-5,9-dienoicacid (14) undergoes efficient copper-catalyzed cyclization to sesquicarone (5). Sesquicarene is obtained by pyrolysis of the sodium salt of the p-toluenesulfonylhydrazone of 5. A direct cyclization of