[NH:1]1[CH2:6][CH:5]=[CH:4][C:3]2[CH2:7][N:8](C(OCC)=O)[CH2:9][C:2]1=2.[ClH:15]>>[ClH:15].[ClH:15].[N:1]1[CH:6]=[CH:5][CH:4]=[C:3]2[CH2:7][NH:8][CH2:9][C:2]=128.5 g (44 mmol) of ethyl 5,7-dihydro-1H-pyrrolo-[3,4-b]pyridine-6-carboxylate are refluxed overnight in 90 ml of concentrated hydrochloric acid. The solution is concentrated, the residue is stirred with acetone, and the salt is filtered off with suction and dried in the air.
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