Formic Acid → HCID 53977657, compound

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2-Cyano-11-(3-dimethylaminopropyl)-11-hydroxy-6,11-dihydro-5H-pyrrolo[2,1-b][3]benzazepine (.62 g.) and 6.2 g. Ni-Al 1:1 alloy powder (BDH Chemicals Ltd., Pool England) in 50 ml. 75% formic acid is refluxed for 1 hr. The dark red suspension is cooled, filtered to remove the insolubles, washed with formic acid and evaporated to dryness. The yield of this red oil is 3.4 g. (57%) and it slowly crystallizes on cooling. The oxalate salt of 2-formyl-11-(3-dimethylaminopropylidene)-6,11-dihydro-5H-pyrrolo[2,1-b][3]-benzazepine is prepared by dissolving the above product in the minimum volume of ethanol and adding dropwise a saturated ethanolic solution of oxalic acid. The resulting crystals are collected by filtration and dried to give 2-formyl-11-(3-dimethylaminopropylidene)-6,11-dihydro-5H-pyrrolo[2,1-b][3]benzazepine oxalate, m.p. 181° C. (decomp.).

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