Synthesis of 2,4-disubstituted pyrimido[4,5-b]-indoles, pyrano[4′,3′:4,5]pyrrolo[2,3-d]pyrimidines and some conversions of pyrimido[4,5-d]indoles

Methods have been developed for the production of 2,4-disubstituted 5,6,7,8-tetrahydro-9H-pyrimido[4,5-b]indoles and pyrano[4′3′:4,5]pyrrolo[2,3-d]pyrimidines. Heterocyclization reactions were carried out on 4-hydrazinopyrimido[4,5-b]indoles.