Stereoselective Synthesis of 2-Isocyanoallopupukeanane
作者:Tse-Lok Ho、Liang-Rern Kung
DOI:10.1021/ol990181d
日期:1999.10.1
[GRAPHICS]A stereoselective synthesis of 2-isocyanoaliopupukeanane (3) in ca, 5% overall yield features an intramolecular Diels-Alder reaction to establish a bridged cydopentane ring to the existing bicyclo[3.2.1]octane unit.
Total Synthesis of (±)-2-Isocyanoallopupukeanane
作者:Tse-Lok Ho、Liang-Ren Kung、Rong-Jie Chein
DOI:10.1021/jo000668w
日期:2000.9.1
addition, S(N)2' displacement, chain extension, and elaboration of the unsaturated ketone 12c which underwent an intramolecular hetero-Diels-Alder reaction to afford 13 containing all the skeletal carbon atoms. The dihydropyran unit was cleaved by ozonolysis to give the tricarbocyclic intermediate which required seven more steps to complete the synthesis.