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The  1 H and  13 C NMR spectroscopic properties of a series of furo[2′,3′:4,5]pyrrolo[1,2- d ][1,2,4]triazin-8(7 H )-ones and -thiones were investigated. The influence of various electron donating as well as electron withdrawing substituents at C-5 or N-7 on  1 H NMR chemical shifts as well as  13 C chemical shifts at C8 were observed. The 5-chloromethyl group had a little influence on the chemical shift of H-7 proton and the 8-thione group causes deshielding of H-7 as well as H-5 protons in comparison with the C-8 carbonyl group.

NMR spectroscopic properties of furo[2′,3′:4,5]pyrrolo[1,2-d][1,2,4]triazine derivatives