3-Aryl- and 2,3-Diaryl-4-oxo-4,5,6,7-tetrahydroindazoles. 2. Reactions of Aryl- and Tosylhydrazones of Dimedone and 1,3-Cyclohexanedione with Some Aromatic and Heteroaromatic Aldehydes

摘要

The reactions of the phenylhydrazone and 2-chlorophenyl-, 2,4-difluorophenyl-, 4-nitrophenyl-, and 2-pyridylhydrazones of dimedone with benzaldehyde, 4-bromo-, 4-fluoro-, 4-(dimethylamino)-, 4-nitrobenzaldehydes, 2-, 3-, and 4-pyridinecarbaldehydes and 2-thiophenecarbaldehyde have given 24 novel 2,3-diaryl-4-oxo-4,5,6,7-tetrahydroindazoles. Treatment of the tosylhydrazones of dimedone and 1,3-cyclohexanedione with pyridine- and thiophenecarbaldehydes yielded 7 novel 3-pyridyl- and 3-thienyl-4-oxo-4,5,6,7-tetrahydroindazoles.