Enantioselective Total Synthesis of Valeriananoids A−C
摘要:
The first enantioselective total synthesis of valeriananoids A-C (-)-1-3 is reported starting from the readily available monoterpene (R)-carvone, employing a tandem intermolecular Michael addition-intramolecular Michael addition-alkylation sequence and an electron-transfer-mediated 6-endo-trig cyclization as key steps.
Biotransformation of the Fungistatic Sesquiterpenoid Patchoulol by <i>Botrytis </i><i>c</i><i>inerea</i>
作者:Josefina Aleu、James R. Hanson、Rosario Hernández Galán、Isidro G. Collado
DOI:10.1021/np980416e
日期:1999.3.1
Biotransformation of the fungistatic sesquiterpenoid patchoulol (1) by the fungus Botrytiscinerea affords the 5-, 7- and (8R)-hydroxy (2, 3, and 5) derivatives as the major metabolites, together with a number of minor metabolites (4, 6-9) arising from hydroxylation at C-2, C-3, C-5, C-9, C-13, and C-14.
unique tricyclic sesquiterpenoids, valeriananoids A–C 1–3, have been synthesized starting from bicyclo[2.2.2]octane-2,5-dione derivative 11, which was obtained by diastereoselective catalytic domino Michael reaction of oxophorone 5 with 8-phenylmenthyl acrylate 10 by LDA or silica-gel-base (NMAP-Li). The tricyclic ring was closed selectively by intramolecular 6-endo-trig mode cyclization of the ketyl radical
Enantioselective Total Synthesis of Valeriananoids A−C
作者:A. Srikrishna、G. Satyanarayana
DOI:10.1021/ol049341y
日期:2004.7.1
The first enantioselective total synthesis of valeriananoids A-C (-)-1-3 is reported starting from the readily available monoterpene (R)-carvone, employing a tandem intermolecular Michael addition-intramolecular Michael addition-alkylation sequence and an electron-transfer-mediated 6-endo-trig cyclization as key steps.