C([N:4]1[CH2:9][CH2:8][C:7]2[S:10][C:11]([N+:13]([O-:15])=[O:14])=[CH:12][C:6]=2[CH2:5]1)(=O)C.[ClH:16]>>[ClH:16].[N+:13]([C:11]1[S:10][C:7]2[CH2:8][CH2:9][NH:4][CH2:5][C:6]=2[CH:12]=1)([O-:15])=[O:14]2.38 g (10.53 mmole) of 5-acetyl-2-nitro-4,5,6,7-tetrahydrothieno[3,2-c]pyridine [prepared as described in step (b) above] were heated under reflux for 2 hours in 60 ml of 10% w/v aqueous hydrochloric acid. The reaction mixture was then concentrated to dryness by evaporation under reduced pressure, to give 2.19 g of the title compound as brown crystals.
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