Intermolecularreactions of planar chiral 9-membered diallylic amides provide a variety of bicyclic compounds with central chiralities in a stereospecific fashion with high group selectivity. Lewis-acid-promoted intramolecularreactions of the obtained bicyclic compounds provide transannular products in a stereospecific fashion. Furthermore, a direct transannular reaction of diallylic amide involving
A Unique Functional Group Transformation of Planar Chiral Diolefinic Organonitrogen Cycles Utilizing PtCl<sub>2</sub>(2,4,6-trimethylpyridine) Complexes
作者:Katsuhiko Tomooka、Maki Shimada、Kazuhiro Uehara、Masato Ito
DOI:10.1021/om1009704
日期:2010.12.27
The planar chiral diolefinic organonitrogen cycles 1 underwent stereospecific and group-selective olefin exchange with 3 to give 4, whose molecular structure was characterized on the basis of NMR and X-ray diffraction. The bonded (E)-olefin moieties in 4 were robust enough to allow untouched (Z)-olefin to undergo epoxidation and hydrogenation to give the corresponding PtCl2(η2-olefin) complexes, whose
amides have stable planar chirality at ambient temperature. The transformation of the enantiomerically enriched amides provides opticallyactive compounds containing stereogenic centers in a stereospecific fashion. As a demonstration of the synthetic utility of the amides, we have synthesized (+)-γ-lycorane using such an opticallyactive amide as a chiral building block.