Catalytic Enantioselective Indium-Mediated Allylation of Hydrazones
作者:Gregory R. Cook、Robert Kargbo、Bikash Maity
DOI:10.1021/ol051160o
日期:2005.6.1
A facile and highly selective indium-mediated allylation of hydrazones utilizing BINOL ligands is described. Chiral (R)-3,3'-bistrifluoromethyIBINOL afforded homoallylic amines in up to 97% ee with stoichiometric ligand. Employing only 10 mol % ligand afforded selectivity of up to 92% ee.
Readily Accessible, Modular, and Tuneable BINOL 3,3‘-Perfluoroalkylsulfones: Highly Efficient Catalysts for Enantioselective In-Mediated Imine Allylation
作者:Robert Kargbo、Yoko Takahashi、Santosh Bhor、Gregory R. Cook、Guy C. Lloyd-Jones、Ian R. Shepperson
DOI:10.1021/ja070742t
日期:2007.4.1
novel mono- and disulfone ligands in just two steps from enantiomerically pure BINOL. These electron-demanding BINOLs have been successfully applied as catalysts for indium-mediated allylation of N-acylhydrazones. A general and highlyenantioselective catalytic process is described, in which the presence of two perfluoroalkylsulfone (SO2RF) groups is shown to be crucial for activity and selectivity.