Ethanol → 3H-Indeno(1,2-c)pyridazin-3-one, 2,4,4a,5-tetrahydro-7-amino-

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Reaction Steps

7-Acetamido-4,4a-dihydro-[5H]-indeno[1,2-c]pyridazin-3[2H]-one (1.50 g) was suspended in hydrazine hydrate (30 ml ) and heated under reflux with ethanol (5 ml ) for 2 hours. The solution was filtered through diatomaceous earth, allowed to cool, then extracted into chloroform. The combined organic extracts were dried over magnesium sulphate and concentrated. Recrystallisation of the crude product from n-propanol gave 7-amino-4,4a-dihydro-[5H]-indeno[1,2-c]pyridazin-3[2H]-one (0.41 g, m.p. 244°-245° C.) as a pale yellow powder; ν(Nujol mull) 3400, 3320, 3220, 1652, 1635, 1600, and 1580cm-1 ; δ(DMSO-d6) 2.50 (3H,m,4-H,5-H2), 3.05 (1H,m,4a-H), 5.67 (2H,s(br),NH2), 6.55 (2H,m,6,H-H), 7.27 (1H,d,9-H).

Provenance & Evidence