On the stereoselective bicyclization of aminodienes catalyzed by chelating diamide complexes of the group 3 metals. A direct comparison of Sc(iii) and Y(iii) bis(amide)s with an application to the synthesis of alkaloid 195F
作者:Tao Jiang、Tom Livinghouse、Helena M. Lovick
DOI:10.1039/c1cc15399d
日期:——
Highly diastereoselective bicyclizations of aminodienes catalyzed by chelating diamide complexes of Sc(III) and Y(III) that lead to pyrrolizidines and indolizidines are described. This bis(annulation) procedure has been utilized in a concise synthesis of the pyrrolizidine alkaloid 195F.
Intramolecular iodoetherification of ene or diene ketals: facile synthesis of spiroketals
作者:Hiromichi Fujioka、Kenji Nakahara、Hideki Hirose、Kie Hirano、Tomohiro Oki、Yasuyuki Kita
DOI:10.1039/c0cc03933k
日期:——
A novel and rapid approach to chiral mono- or di-substituted spiroketals based on remote asymmetric induction by intramolecular iodoetherification of ene or diene ketals has been developed. This strategy concisely offers 5,5- and 5,6-spiroketals including the natural insect pheromone of the wasp.