Condensation of o-phenylenediamine with isatine in refluxing glacial acetic acid gives indolo[2,3-b] quinoxaline. This moiety further condensed with n’-(n-Halo aloxy)-3,4-dihydro carbostyril in refluxing acetonitrile using NaI,K2CO3 and TBAB as catalyst gave us desire product. Series of all six analogs are taken for their antibacterial and antipsychotic activity. The entire tested compound showed slight antibacterial as well as antipsychotic activity. This slight antimicrobial activity is due to presence of indolo[2,3-b] quinoxaline, and moderate antipsychotic activity due to the structural resemblance with the antipsychotic drug Aripiperazole.