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A series of methyl 9H-pyridazino[3,4-b]indole-3-carboxylates and related compounds were synthesized using a Diels-Alder reaction of methyl 3-(1H-indol-3-yl)-2-propenoates and dibenzyl azodicarboxylate. Several compounds were found to have high affinity for the benzodiazepine receptor. Their structure-activity relationships are discussed.

Synthesis and Benzodiazepine Receptor Binding Studies of Pyridazino[3, 4-b]indoles