Versatile Construction of 6-Substituted <i>cis</i>-2,8-Dioxabicyclo[3.3.0]octan-3-ones: Short Enantioselective Total Syntheses of Cheloviolenes A and B and Dendrillolide C
作者:Yuriy Slutskyy、Christopher R. Jamison、Peng Zhao、Juyeol Lee、Young Ho Rhee、Larry E. Overman
DOI:10.1021/jacs.7b04265
日期:2017.5.31
A short enantioselective synthesis of 6-substituted cis-2,8-dioxabicyclo[3.3.0]octan-3-ones is described. The pivotal step is coupling of a tertiary radical generated directly from a tertiary alcohol with a 3-chloro-5-alkoxybutenolide. This strategy is applied toward scalable 14–15 step syntheses of three rearranged spongian diterpenoids: cheloviolenes A and B and dendrillolide C.
Nitrogen insertion to bicyclo[2.2.1]heptanones; the photo-Beckmann rearrangement of oximes of (+)-fenchone and (+)-camphor1,2
作者:Hiroshi Suginome、Kenji Furukawa、Kazuhiko Orito
DOI:10.1039/c39870001004
日期:——
The major products of the photolysis of the oximes of two natural bicyclo[2.2.1]heptanones, (+)-fenchone and(+)-camphor, in methanol are nearly equal amounts of two isomeric lactams arising from the photo-Beckmann rearrangement and the corresponding ring-opened amides.