2-Allyl- and 2-Benzylmaleopimarimide Acyl Isothiocyanates: Synthesis of Triazoles

The reaction of acyl isothiocyanates of 2-allyl- and 2-benzylmaleopimarimides with ethyl-, benzylhydrazine, or ethyl ester of hydrazinoacetic acid leads to the formation of maleopimarimides containing the fragment of 5-thioxo-2,5-dihydro-1H-1,2,4-triazole. The structures of the synthesized compounds were determined by H-1, C-13, H-1-C-13 HSQC, H-1-C-13 HMBC, COSY, NOESY, and H-1-N-15 HMBC NMR spectroscopy methods.