Stereoselective Synthesis of Bicyclic Tertiary Alcohols with Quaternary Stereocenters via Intramolecular Crossed Benzoin Reactions Catalyzed by <i>N</i>-Heterocyclic Carbenes
Bicyclic tertiary alcohols 1 bearing quaternary stereocenters at the two adjacent bridgehead positions were synthesized with high stereoselectivity via the intramolecular crossed benzoin reactions catalyzed by NHC organocatalysts.
Efficient Construction of Polycyclic Derivatives via a Highly Selective Cu<sup>I</sup>-Catalyzed Domino Reductive-Aldol Cyclization
作者:Julia Deschamp、Olivier Riant
DOI:10.1021/ol802879f
日期:2009.3.19
A versatile methodology for the diastereo- and enantioselective domino reductive-aldol cyclizations is reported. By using a copper (I)/diphosphane ligand, various five- and six-membered rings were generated with good to excellent diastereo- and enantioselectivities (cis:trans up to 100:0 and ee up to 95%).