Author/Authors :
Harada، نويسنده , , Shinji and Toudou، نويسنده , , Nozomi and Hiraoka، نويسنده , , Shiharu and Nishida، نويسنده , , Atsushi، نويسنده ,
Abstract :
The synthesis and utility of the novel axially chiral bis-urea ligand BINUREA are described. A complex of this urea ligand with ytterbium triflate and DBU can be used in the catalytic enantioselective Diels–Alder reaction of Danishefsky-type diene and electron-deficient olefins to give the adducts in good to excellent yield and enantiomeric excess (ee).
