[N:1]1[C:9]2[CH2:8][CH2:7][N:6](C(OCC)=O)[CH2:5][C:4]=2[S:3][C:2]=1[C:15]([O:17]CC)=[O:16].[ClH:20]>[OH-].[K+]>[ClH:20].[N:1]1[C:9]2[CH2:8][CH2:7][NH:6][CH2:5][C:4]=2[S:3][C:2]=1[C:15]([OH:17])=[O:16]Diethyl 6,7-dihydrothiazolo[5,4-c]pyridine-2,5(4H)-dicarboxylate (1.76 mmol) in 3.5 N KOH solution (3 ml) was refluxed for 3 h (monitored by TLC). The reaction mixture was cooled to 0° C. and acidified with conc. HCl. The solid was collected by filtration and dried to yield the desired product. Yield: 60%.
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