D- and L-carbocyclic nucleosides were obtained by a new procedure involving an enantioselective rhodium/duphos-catalyzed hydroacylation reaction as the keystep. The 3-hydroxymethyl-cyclopentanol intermediate was obtained by stereoselective reduction of ketone and by dynamic kinetic resolution (DKR).
Catalytic Asymmetric Intramolecular Hydroacylation with Rhodium/Phosphoramidite-Alkene Ligand Complexes
作者:Thomas J. Hoffman、Erick M. Carreira
DOI:10.1002/anie.201104595
日期:2011.11.4
Give me a P: An asymmetricintramolecular Rh‐catalyzed hydroacylation reaction of pent‐4‐enals for the preparation of functionalized cyclopentanones in good yield and high enantioselectivity is described (see scheme, DCE=dichloroethane). This process uses rhodiumcomplexes featuring novel modular phosphoramidite–alkene ligands and achiral phosphine coligands.