Asymmetric synthesis of (+)-castanospermine through enol ether metathesis–hydroboration/oxidation
作者:Julien Ceccon、Grégory Danoun、Andrew E. Greene、Jean-François Poisson
DOI:10.1039/b901488h
日期:——
An asymmetric synthesis of (+)-castanospermine is presented in which enolether metathesis–hydroboration/oxidation is used for stereoselective installation of the trans-transhydroxyl groups on the piperidine ring of the alkaloid.
The totalsynthesis of (−)-omuralide, a potent specific proteasome inhibitor, has been achieved through an unprecedented route. The C3 and C4 chiral centers of the natural product have been selectively installed by an asymmetric [2 + 2]-cycloaddition between an unusual oxadisilinane ketene and a chiral enol ether, while the γ-lactam core was prepared by a single-pot two-step Beckmann transposition