Q. Nguyen, J. Jeong
Jul 8, 2008
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0
Influential Citations
6
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Journal
ChemInform
Abstract
Chiral ligands possessing C2 symmetry derived from (R,R)-1,2-diaminocyclohexane are particularly attractive auxiliaries to serve as powerful stereodirecting reagents or ligands in asymmetric synthesis, as chiral stationary phases in chromatographic separation and molecular recognition, and as chelating agents for many metals. Trans-1,2-diaminocyclohexane is commercially available at relatively low cost today. It is easily resolved in aqueous medium using Lor D-tartaric acid to obtain the (R,R)-1,2 or the (S,S)-1,2-enantiomer respectively in enantiopure forms. Beside outstanding chiral 1,2-diaminocyclohexane derivatives were synthesized and used as chiral ligands effectively in asymmetric synthesis such as chiral diimines, chiral salens, β-amino alcohols, tetradentate chiral Schiff base ligands, recently the synthesis and application of chiral amines including in N-monosubstituted; N,N'-disubstituted; N,N'-trisubtituted and N,N'-tetrasubstituted have great progress. Some chiral 1,2-diaminocyclohexane derivatives of novel chiral N4S2and N4S3-donor macrocyclic ligands, 10