[reaction: see text] (R,R)-3-Aza-3-benzyl-1,5-dihydroxy-1,5-diphenylpentane (1) ligated Ti(IV) complex (1-TiCl(2)) is used as a chiral Lewis acid catalyst for promoting asymmetric IED Diels-Alder reaction between electron-rich dienophiles and electron-poor dienes. Here we introduce a facileroute for the synthesis of asymmetric tetrahydroquinoline derivatives using the above-mentioned chiral catalyst
Cycloaddition of N-arylimines with α-methylstyrenesor 2,3-dihydrofuran was efficiently catalyzed by tris(4-bromophenyl)aminiumhexachloroantimonate (Ar3N + ËSbCl6 - ) producing tetrahydroquinolinederivatives in excellent yields. The reaction was controlled sensitivelyby the oxidation potentials of the imine and the dienophile.