Synthesis of new six and five membered heterocyclic compounds including oxygen and nitrogen was reported and following compounds were synthesized: 1.Synthesis of novel tetrahydrobenzo[4,5]imidazo[2,1-b]chromeno[4,3,2-de]quinazoline 3 and Это и многое другое вы найдете в книге Synthesis of six and five membered heterocyclic compounds including oxygen and nitrogen (Mina Saeedi)