An asymmetric synthesis of the furanocembrane (-)-bipinnatin J (3a) found in gorgonian corals is described. Treatment of 3a with VO(acaC)(2)-'BuOOH, followed by acetylation, gave acetoxypyranone 15. When 15 was heated in the presence of DBU, it underwent a transannular oxidopyrylium-alkene [5+2] cycloaddition producing the polycyclic diterpene (+)-intricarene 1, isolated from the coral Pseudopterogorgia kallos. The total synthesis of intricarene 1 mimics its most likely biosynthesis via oxidation of bipinnatin J (3a) in vivo. (c) 2006 Elsevier Ltd. All rights reserved.
Total synthesis of (+)-intricarene using a biogenetically patterned pathway from (−)-bipinnatin J, involving a novel transannular [5+2] (1,3-dipolar) cycloaddition
作者:Bencan Tang、Christopher D. Bray、Gerald Pattenden
DOI:10.1039/b910572g
日期:——
it gave (+)-intricarene 1, which is found in P. kallos, via a novel transannular [5+2] (or 1,3-dipolar) cycloaddition involving the butenolide-oxidopyrylium ion intermediate 31. We believe that this totalsynthesis of (+)-intricarene 1 mimics its most likely origin in nature viaoxidation of (−)-bipinnatin J (4a), presumably involving photochemically generated singlet oxygen or possibly a P450 monooxygenase
作者:Bencan Tang、Christopher D. Bray、Gerald Pattenden
DOI:10.1016/j.tetlet.2006.06.150
日期:2006.9
An asymmetric synthesis of the furanocembrane (-)-bipinnatin J (3a) found in gorgonian corals is described. Treatment of 3a with VO(acaC)(2)-'BuOOH, followed by acetylation, gave acetoxypyranone 15. When 15 was heated in the presence of DBU, it underwent a transannular oxidopyrylium-alkene [5+2] cycloaddition producing the polycyclic diterpene (+)-intricarene 1, isolated from the coral Pseudopterogorgia kallos. The total synthesis of intricarene 1 mimics its most likely biosynthesis via oxidation of bipinnatin J (3a) in vivo. (c) 2006 Elsevier Ltd. All rights reserved.