Diphenylamine-linked chiral bis(oxazoline) ligand without c-symmetry, synthesis method and application thereof

Abstract

The present invention discloses a diphenylamine-linked chiral bis(oxazoline) ligand without C-symmetry of formula 3 and its synthesis method and application in an asymmetric catalytic reaction, wherein C-symmetry is lost by introducing different groups into the diphenylamine backbone to realize precise control of 'electronic effect' of the ligand backbone. An anthranilic acid derivative and an orthochlorobenzoic acid derivative are used as starting materials to prepare a compound of formula 1, and then the compound of formula 1 is reacted with a chiral amino alcohol compound to prepare a β-bishydroxy amide compound of formula 2, and the compound of formula 2 is further subjected to condensation to obtain the diphenylamine-linked chiral bis(oxazoline) ligand without C-symmetry of formula 3. The present invention also provides an application of a catalyst formed by coordination of the diphenylamine-linked chiral bis(oxazoline) ligand without C-symmetry with copper salt, zinc salt, nickel salt, iron salt or rhodium salt, in an asymmetric catalytic reaction.