Palladium-Catalyzed Ring Opening of Isoprene Monoxide with Nitrogen Nucleophiles - Asymmetric Synthesis of Branched Amino Sugars
作者:Barry M. Trost、Chunhui Jiang、Kristin Hammer
DOI:10.1055/s-2005-918443
日期:——
The Pd-catalyzed regio- and enantioselective ring opening of isoprene monoxide with primary amines as pronucleophiles is developed with good yield and enantioselectivity, constructing a quaternary stereocenter enantioselectively. This methodology was used as the chirality inducing key step in the asymmetric synthesis of vancosamine derivative 19. The synthesis was achieved in 9 total steps and 28.6%
Dynamic Kinetic Asymmetric Transformation of Diene Monoepoxides: A Practical Asymmetric Synthesis of Vinylglycinol, Vigabatrin, and Ethambutol
作者:Barry M. Trost、Richard C. Bunt、Rémy C. Lemoine、Trevor L. Calkins
DOI:10.1021/ja000547d
日期:2000.6.1
The ability to perform a dynamickineticasymmetrictransformation (DYKAT) using the palladium-catalyzed asymmetric allylic alkylation (AAA) is explored in the context of butadiene monoepoxide. The versatility of this commercially available, but racemic, four-carbon building block becomes significantly enhanced via conversion of both enantiomers into a single enantiomeric product. The concept is explored