Synthesis and activities of tricyclic pyrido[3,4-g]quinazolines, pyrazolo[3,4-g]quinoxalines and pyrroloindazole regioisomers

Heteroaromatics constitute an important class of organic compounds with wide-ranging applications. This account, including patent literature, describes reported synthetic methods leading to tricyclic nitrogencontaining heterocyclic systems (pyrido[3,4-g]quinazolines, pyrazolo[3,4-g]quinoxalines and pyrroloindazoles) which are found in many biologically active compounds.