Enantioselective catalysis by 1-(1-isoquinolinyl)-2-naphthalenemethanol: An atropisomerically chiral NO chelating ligand
作者:Robert W. Baker、Simon O. Rea、Melvyn V. Sargent、Elisabeth M.C. Schenkelaars、Brian W. Skelton、Allan H. White
DOI:10.1016/s0957-4166(00)80482-6
日期:1994.1
1-(tert-butylsulfinyl)isoquinoline 2 with the 1-naphthyl Grignardreagent 4. Resolution of the ligand 6 was achieved through chromatographic separation of the Noe-lactol® derivatives. The absolute configuration of (R)-(-)-6 was determined by a single crystal X-ray study of the p-bromobenzoate derivative 9. (R)-(-)-6 enantioselecdvely catalysed the addition of diethylzinc to benzaldehyde, affording (S)-(-)
Enantioselective synthesis of axially chiral 1-(1-naphthyl)isoquinolines and 2-(1-naphthyl)pyridines through sulfoxide ligand coupling reactions
作者:Robert W. Baker、Simon O. Rea、Melvyn V. Sargent、Elisabeth M.C. Schenkelaars、Tjitjik Srie Tjahjandarie、Angela Totaro
DOI:10.1016/j.tet.2005.02.008
日期:2005.4
coupling reactions of (R)-(+)- and (S)-(−)-2-[(4′-methylphenyl)sulfinyl]-3-methylpyridines, (R)-(+)-17 and (S)-(−)-17, with 2-methoxy-1-naphthylmagnesium bromide providing (−)- and (+)-2-(2′-methoxy-1′-naphthyl)-3-methylpyridines, (−)-18 and (+)-18, in 53 and 60% ee, respectively. The free energy barriers to internalrotation in 3b and 18 have been determined, and the isoquinoline (R)-(−)-12 examined as a