Total synthesis of (−)-kjellmanianone from tricyclodecadienone. A revision of its absolute configuration
摘要:
A stereocontrolled total synthesis of the naturally occurring cyclopentenoid (-)-kjellmanianone (8) under bar has been accomplished starting from enantiopure (+)-tricyclo[5.2.1.0(2,6)]decadienone 2-carboxylic ester (5) under bar. Key steps in this approach to (8) under bar include Barton's halodecarboxylation of <(17)under bar> followed by methoxylation to produce <(20)under bar>, nucleophilic epoxidation of enolacetate <(26)under bar> to introduce the alpha-hydroxyketone moiety and thermal fragmentation of <(27)under bar> using flash vacuum thermolysis (FVT) to give (8) under bar. The R configuration of synthetic (-)-kjellmanianone was unequivocally established by an X-ray diffraction analysis of its precursor <(27)under bar>: implying that the previously assigned absolute configuration of(+)-kjellmanianone is incorrect.
Stereospecific total synthesis of (−)-kjellmanianone and a revision of its absolute configuration
作者:Jie Zhu、Antonius J.H. Klunder、Binne Zwanenburg
DOI:10.1016/s0040-4039(00)77033-x
日期:1994.4
of naturally occurring kjellmanianone has been accomplished starting from tricyclo[5.2.1.02,6]decadienone 2-carboxylic ester . The key steps in this approach to include Barton's halodecarboxylation methodology, nucleophilic epoxidation to introduce the hydroxy group and ultimately, a cycloreversion by usingflashvacuumthermolysis. The R configuration of synthetic (−)-kjellmanianone was unequivocally