Highly enantioselective hydroformylation of dihydrofurans catalyzed by hybrid phosphine–phosphonite rhodium complexes
作者:Samir H. Chikkali、Rosalba Bellini、Guillaume Berthon-Gelloz、Jarl Ivar van der Vlugt、Bas de Bruin、Joost N. H. Reek
DOI:10.1039/b924046b
日期:——
Unprecedented regio- and enantioselectivities (>91%) are reported for the Rh-catalyzed asymmetric hydroformylation of 2,3- and 2,5-dihydrofuran using tunable hybrid phosphineâphosphonite ligands.
Highly Selective Asymmetric Rh-Catalyzed Hydroformylation of Heterocyclic Olefins
作者:Samir H. Chikkali、Rosalba Bellini、Bas de Bruin、Jarl Ivar van der Vlugt、Joost N. H. Reek
DOI:10.1021/ja210117z
日期:2012.4.18
predominant ee coordination. Application of the small bite-angle ligands L1 and L2 in the highly selective asymmetrichydroformylation (AHF) of the challenging substrate 2,3-dihydrofuran (1) yielded the 2-carbaldehyde (3) as the major regioisomer in up to 68% yield (with ligand L2) along with good ee's of up to 62%. This is the first example in which the asymmetrichydroformylation of 1 is both regio- and