The First Examples of Planar Chiral Organic Benzimidazole Derivatives
作者:Gareth Rowlands、Peter Hitchcock、Andrew Hodgson
DOI:10.1055/s-2006-950432
日期:2006.9
The synthesis of a number of novel planar chiral benzimidazoles from [2.2]paracyclophane is reported. The key steps include a Buchwald-Hartwig amination of a sterically demanding triflate and the functionalisation of the C-2 bromide.
Synthesis of Pseudo-<i>geminal</i>-, Pseudo-<i>ortho</i>-, and <i>ortho-</i>Phosphinyl-oxazolinyl-[2.2]paracyclophanes for Use as Ligands in Asymmetric Catalysis
作者:Daniel K. Whelligan、Carsten Bolm
DOI:10.1021/jo060668h
日期:2006.6.1
three regioisomers of aromatic-substituted phosphinyl-oxazolinyl-[2.2]paracyclophanes, pseudo-geminal, pseudo-ortho, and ortho, have been carried out or, in the latter two cases, newly developed. It has, therefore, been demonstrated that all aromatic-substituted isomers relevant for use as chelating ligands for asymmetriccatalysis are accessible. These P,N-ligands, along with their diastereoisomers