Azaarene cis-dihydrodiol-derived 2,2′-bipyridine ligands for asymmetric allylic oxidation and cyclopropanation
作者:Derek R. Boyd、Narain D. Sharma、Lenuta Sbircea、Deirdre Murphy、Tayeb Belhocine、John F. Malone、Stuart L. James、Christopher C. R. Allen、John T. G. Hamilton
DOI:10.1039/b814678k
日期:——
Biphenyl dioxygenase-catalysed cis-dihydroxylation of 2-chloroquinoline, 2-chloro-3-methylquinoline and 2-chloro-6-phenylpyridine substrates yielded the corresponding enantiopure cis-dihydrodiols; enantiopure 2,2â²-bipyridines, synthesised in four steps from 2-chloroquinoline, proved to be efficient chiral ligands in catalytic asymmetric allylic oxidation and cyclopropanation reactions of alkenes.
Chemoenzymatic synthesis of chiral 2,2′-bipyridine ligands and their N-oxide derivatives: applications in the asymmetric aminolysis of epoxides and asymmetric allylation of aldehydes
作者:D. R. Boyd、N. D. Sharma、L. Sbircea、D. Murphy、J. F. Malone、S. L. James、C. C. R. Allen、J. T. G. Hamilton
DOI:10.1039/b919894f
日期:——
A series of enantiopure 2,2′-bipyridines have been synthesised from the corresponding cis-dihydrodiol metabolites of 2-chloroquinolines. Several of the resulting hydroxylated 2,2′-bipyridines were found to be useful chiral ligands for the asymmetric aminolysis of meso-epoxides leading to the formation of enantioenriched aminoalcohols (→84% ee). N-oxide and N,N′-dioxide derivatives of these 2,2′-bipyridines