The first totalsynthesis of chiral 2-pupukeanone (+)-4, starting from R-carvone (–)-7 employing a 5-exo-trig radical cyclisation as the key reaction for the construction of the tricyclic isotwistane carbon framework, is described.
Chiral synthons from carvone. Part 31.† Enantiospecific total synthesis of (+)-2-pupukeanone and 5-epi-2-pupukeanone
作者:Adusunilli Srikrishna、T. Jagadeeswar Reddy
DOI:10.1039/a802649a
日期:——
The first enantiospecific totalsynthesis of (+)-2-pupukeanone and 5-epi-2-pupukeanone has been achieved starting from (R)-carvone, employing a radical cyclisation reaction based approach. (R)-Carvone has been transformed into the bicyclo[2.2.2]octenone 12 via kinetic alkylation, bromination of the isopropenyl moiety and intramolecular alkylation, which on further alkylation with prenyl bromide leads