Enantioselective rhodium catalyzed hydroboration of olefins using chiral bis(aminophosphine) ligands
作者:Jean-Michel Brunel、Gérard Buono
DOI:10.1016/s0040-4039(99)00538-9
日期:1999.4
The synthesis of new chiral bis(aminophosphine) ligands 1–5 was achieved and assessed in the enantioselectiverhodium catalyzed hydroboration of various olefins with catecholborane. Enantioselectivities up to 77% were obtained.
KITAGUCHI, NOBUYA, CHEM. EXPRESS, 4,(1989) N1, C. 737-740
作者:KITAGUCHI, NOBUYA
DOI:——
日期:——
Design of Chiral Hydroxyalkyl‐ and Hydroxyarylazolinium Salts as New Chelating Diaminocarbene Ligand Precursors Devoted to Asymmetric Copper‐Catalyzed Conjugate Addition
The design and the synthesis of a set of new chiral hydroxyalkyl- and hydroxyaryl-chelating diaminocarbene ligands is reported. Comparative catalytic studies show the importance of the scaffold design around the NHC unit to obtain a high enantiocontrol in Cu-catalyzed asymmetricconjugateaddition (ACA). Whereas low selectivities are observed when the stereogenic centre is placed within the N-heterocyclic