Ligand-Controlled Selectivity in the Desymmetrization of <i>meso</i> Cyclopenten-1,4-diols via Rhodium(I)-Catalyzed Addition of Arylboronic Acids
作者:Frederic Menard、David Perez、Daniela Sustac Roman、Timothy M. Chapman、Mark Lautens
DOI:10.1021/jo100391e
日期:2010.6.18
a Rh-catalyzed asymmetric allylic substitution. Depending on the type of ligand used, each of two regioisomeric products can be obtained in good yield and excellent enantioselectivity. Under rhodium(I) catalysis, bisphosphine P-Phos ligands form trans-1,2-arylcyclopentenols as the major product, whereas Segphos ligands lead predominantly to trans-1,4-arylcyclopentenols.
Desymmetrization of meso-2-Alkene-1,4-diol Derivatives through Copper(I)-Catalyzed Asymmetric Boryl Substitution and Stereoselective Allylation of Aldehydes
Breaking the mirror: The reaction sequence described in the title was applied to the synthesis of a valuable chiral drug precursor and the rapid stereoselective assembly of complex compounds with multiple chiral centers (see scheme).