Synthesis of (±)-eriobrucinol and regioisomeric monoterpenoid coumarins, using intramolecular cycloadditions
作者:Leslie Crombie、Sally D. Redshaw、David A. Slack、Donald A. Whiting
DOI:10.1039/p19830001411
日期:——
the three regioisomers (8), (13), and (16), of the eriobrucinol structure, are reported. The (±)-cyclol (8) is spectrally identical with natural (–)-eriobrucinol from Eriostemon brucei, thus confirming Jefferies and Worth's structural proposal by synthesis.
作者:Aaron J. Day、Joel H. Z. Lee、Quang D. Phan、Hiu C. Lam、Adam Ametovski、Christopher J. Sumby、Stephen G. Bell、Jonathan H. George
DOI:10.1002/anie.201812432
日期:2019.1.28
The first total synthesis of bruceol has been achieved using a biomimetic cascade cyclization initiated by a stereoselective Jacobsen–Katsuki epoxidation (and kinetic resolution) of racemic protobruceol‐I. A bacterial cytochrome P450 monooxygenase was also found to catalyze the conversion of protobruceol‐I into bruceol. The first full analysis of the NMR data of natural bruceol suggested that “isobruceol”
Biomimetic Synthetic Studies on the Bruceol Family of Meroterpenoid Natural Products
作者:Aaron J. Day、Christopher J. Sumby、Jonathan H. George
DOI:10.1021/acs.joc.9b02862
日期:2020.2.21
The key step in the synthesis of both bruceol and isobruceol was an intramolecular hetero-Diels-Alder reaction of an o-quinone methide that was formed by dearomatization of an electron-rich chromene. The synthesis of an elusive biosynthetic intermediate also allowed a concise synthesis of eriobrucinol via a photochemical [2 + 2] cycloaddition. Furthermore, some speculation on the biosynthesis of prenylated