Tandem Cycloaddition Reactions of Allenyl Diazo Compounds Forming Triquinanes via Trimethylenemethane Diyls
作者:Taek Kang、Won-Yeob Kim、Yeokwon Yoon、Byung Gyu Kim、Hee-Yoon Lee
DOI:10.1021/ja207591e
日期:2011.11.16
A tandem reaction strategy for forming triquinanes from linear allenyl diazo compounds through an intramolecular 1,3-dipolar cycloadditionreaction of an allenyl diazo group that generates a trimethylenemethane (TMM) diyl followed by an intramolecular [2 + 3] TMMdiylcycloadditionreaction has been developed. The new tandem cycloadditionreaction is readily applicable to the synthesis of complex molecules
A unique asymmetric totalsynthesis of the unnatural enantiomer of pregnanolone, as well as a study of its biological activity at the NMDA receptor, is reported. The asymmetry is introduced by a highly atom-economic organocatalytic Robinson annulation. A new method for the construction of the cyclopentane D-ring consisting of CuI-catalyzed conjugate addition and oxygenation followed by thermal cyclization
Enantiocontrolled Synthesis of Jasmonates via Tandem Retro-Diels−Alder−Ene Reaction Activated by a Silyl Substituent
作者:Katsufumi Suzuki、Kohei Inomata、Yasuyuki Endo
DOI:10.1021/ol036253p
日期:2004.2.1
[reaction: see text] An enantiocontrolled synthesis of (-)-methyl 6-epi-cucurbate and (+)-methyl jasmonate was established from a chiral tricyclic lactone via a new type of tandem retro-Diels-Alder-ene reaction activated by a trimethysilyl substituent as the key step.