Stereochemical Diversity in Chiral Ligand Design: Discovery and Optimization of Catalysts for the Enantioselective Addition of Allylic Halides to Aldehydes
作者:Jae-Young Lee、Jeremie J. Miller、Steven S. Hamilton、Matthew S. Sigman
DOI:10.1021/ol050528e
日期:2005.4.1
simple amino acids that promote the Cr-catalyzed enantioselective addition of allylichalides to aldehydes in up to 95% ee. The Cr-catalyzed allylation using ligand 1d is rather insensitive to the nature of the allylic bromide (crotyl, allyl, and methallyl) in that >90% ee is observed for all three bromides evaluated in the addition to benzaldehyde.
作者:Jeffrey W. Bode、Donald R. Gauthier Jr.、Erick M. Carreira
DOI:10.1039/b107995f
日期:2001.12.19
The titanium fluoride-BINOL catalyzed asymmetric allylsilylation of alpha,alpha -disubstituted aldehydes provides facile access to highly functionalized, chiral building blocks, which following simple recrystallization affords a key versatile starting material for polyketide synthesis in 96% ee.