摘要:
PROBLEM TO BE SOLVED: To provide a solid chiral zirconium catalyst which is capable of effecting long-term preservation and which is suitable for catalystic asymmetry aldol reaction and catalytic asymmetry hetero Diels-Alder reaction and to provide a synthetic method of an aldol reaction product or cyclized compound using the same. SOLUTION: The synthetic method uses a powder zirconium catalyst obtained by reacting a binaphthol or its enantiomer with a zirconium compound in an organic solvent, adding a nonpolar solvent to the reaction mixture and isolating the resulting solid precipitation. COPYRIGHT: (C)2008,JPO&INPIT
摘要:
Osmium-catalyzed methods of addition to an olefin are discussed. In the method of asymmetric dihydroxylation of the present invention, an olefin, a chiral ligand, an organic solvent, water, an oxidant and an osmium-containing compound are combined. In the method of asymmetric oxyamination of the present invention, an olefin, a chiral ligand, an organic solvent, water, a metallochloramine derivative, an osmium-containing compound and, optionally, a tetraalkyl ammonium compound are combined. In the method of asymmetric diamination of the present invention, an olefin, a chiral ligand, an organic solvent, a metallo-chloramine derivative, an amine and an osmium-containing compound are combined. In one embodiment, an olefin, a chiral ligand which is a polymeric dihydroquinidine derivative or a dihydroquinine derivative, acetone, water, a base, an oxidant and osmium tetroxide are combined to effect asymmetric dihydroxylation of the olefin.