Reactions of Azines. 6. Thermal Rearrangements of 1,1-Disubstituted-2,3-diaza-4-methyl-1,3,5,6-heptatetraene to 4,9-Dihydropyrazoloisoquinolines and Side Products

Article abstract of DOI:10.1021/jo00170a004

The preparation of 4,9-dihydropyrazolo<1,5-b>isoquinolines (16 or/and 18) was accomplished by allowing the corresponding ketenes to react with (2-((diphenylmethylene)hydrazono)propylidene)triphenylphosphorane (10) and (2-((methylphenylmethylene)hydrazono)