Synthesis and spectroscopic characterizations of both 1-ethyl-4,8-dihydro-10-methoxy-3-methyl-8-R1-6-R2-dipyrazolo[3,4-b:4 ',3'f]-[1,5]diazocin-5(1H)-ones and 1-ethyl-1,4,8,9-tetrahydro-3,9-dimethyl-8-R1-6-R2-di

Article abstract of DOI:10.1002/jhet.5570320530

The non-selective methylation of compounds 3a-d using ethereal diazomethane, allowed the synthesis of isomers 4 and 5 which were useful intermediates for the preparation, by a simple approach, of the title compounds 7 and 9. A complete assignment of the c