Triphenyl phosphonium perchlorate-catalyzed imino Diels-Alder synthesis of azabicyclo[2.2.2]octan-5-ones

A facile synthesis of azabicyclo [2.2.2]octan-5-ones by triphenyl phosphonium perchlorate-catalyzed imino Diels-Alder reaction of Schiff bases with cyclohex-2-enone.