Abstract
Novel 1-[6-(
p
-tolyl) pyridazin-3-yl]pyrazole-
o
-aminonitriles (
3a-c
) were formed using 3-hydrazino-6-(
p
-tolyl)pyridazine (
2
) and ketene
S,S
-acetals (
1a
),
S,N
-acetals (
1b
) or tetracyanoethylene (
1c
). The pyrazole-
o
-aminonitriles (
3a-c
) were in turn used as precursors for the preparation of previously unreported 1-[6-(
p
-tolyl)-pyridazin-3-yl]pyrazolo[3,4-
d
]pyrimidines (
8, 9, 13-20
) and 7-[6-(
p
-tolyl) pyridazin-3-yl]2-arylpyrazolo[3,4-
d
]1,2,4-triazolo[5,1-
f
]pyrimidines (
10-12
) which are expected to possess considerable chemical and pharmacological activities.