Asymmetric Total Synthesis of (+)-Tolterodine, a New Muscarinic Receptor Antagonist, via Copper-Assisted Asymmetric Conjugate Addition of Aryl Grignard Reagents to 3-Phenyl-prop-2-enoyl-oxazolidinones
Ligand-based improvement of enantioselectivity in the catalytic asymmetric dihydroxylation of dialkyl substituted olefins
作者:Tomoyuki Shibata、Declan G. Gilheany、Brent K. Blackburn、K.Barry Sharpless
DOI:10.1016/s0040-4039(00)97477-x
日期:1990.1
A high level of asymmetric induction was achieved in the asymmetricdihydroxylation of dialkyl substituted olefins using 9-O-aryldihydroquinidines as ligands.
Efficient diastereoselective pinacol coupling reaction of aliphatic and aromatic aldehydes by using newly utilized low valent titanium bromide and iodide species
Reductive coupling reaction of aromatic and aliphatic aldehydes proceeded under mild conditions to give the corresponding pinacols in moderate to high yields and dl-diastereoselectivities by using combinations of either low valent titanium(II) bromide and copper or titanium(IV) iodide and copper in a mixed solvent of dichloromethane and pivalonitrile. In the case of using titanium(IV) iodide and copper
Regio-controlled functionalization of 2,5-dimethyl-2,4-hexadiene into epoxy alcohols by photooxygenation in the presence of titanium(IV) or vanadium(V)
作者:Waldemar Adam*、Eugen Staab
DOI:10.1016/s0040-4039(00)80141-0
日期:——
Using Ti(OiPr)4 as oxygen transfer catalyst, the diene 1 affordedexclusively the epoxyalcohol 1c, but VO(acac)2 gave exclusively the isomerized epoxyalcohol 2c during its ene reaction with singlet oxygen.