New chiral 2,2′-bipyridine diols as catalysts for enantioselective addition of diethylzinc to benzaldehyde
作者:Hoi-Lun Kwong、Wing-Sze Lee
DOI:10.1016/s0957-4166(99)00399-7
日期:1999.9
New C-2-symmetric chiral 2,2'-bipyridine diols were prepared from readily available homochiral materials such as menthone and camphor. Their catalytic activities in the reaction of diethylzinc with benzaldehyde to give 1-phenyl-1-propanol were studied. In all cases, the yields were good and enantioselectivities up to 95% were observed. (C) 1999 Elsevier Science Ltd. All rights reserved.
Synthesis and Applications of 3-[6-(Hydroxymethyl)pyridin-2-yl]-1,1′-bi-2-naphthols or 3,3′-Bis[6-(hydroxymethyl)pyridin-2-yl]-1,1′-bi-2-naphthols
A series of new 1,1'-bi-2-naphthol (BINOL) derived ligands, 3-[6-(hydroxymethyl)pyridin-2-yl]-BINOLs or 3,3'-bis[6(hydroxymethyl)pyridin-2-yl]-BINOLs, bearing one or two chiral pyridinylmetlianols attached to a binaphthyl skeleton, have been synthesized using the Suzuki cross-coupling reaction. The resulting compounds have been used as ligands in the enantioselective addition of diethylzinc to aldehydes;