[H-].[Al+3].[Li+].[H-].[H-].[H-].[N:7]1[C:15]2[CH2:14][CH2:13][N:12]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:11][C:10]=2[S:9][C:8]=1[C:23](OC)=[O:24]>O1CCCC1>[OH:24][CH2:23][C:8]1[S:9][C:10]2[CH2:11][N:12]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:13][CH2:14][C:15]=2[N:7]=1To a suspension of lithium aluminium hydride (3.986 mmol) in dry tetrahydrofuran (12 ml) was added 5-tert-butyl 2-methyl 6,7-dihydrothiazolo[5,4-c]pyridine-2,5(4H)-dicarboxylate (3.22 mmol) in tetrahydrofuran (10 ml) at 0° C. and the resulting reaction mixture was stirred at the same temperature for 1 h. It was quenched with saturated aqueous sodium sulfate solution, diluted with ethyl acetate and filtered. The filtrate was evaporated under reduced pressure to give the crude product which was used in the next step without further purification. Yield: 66%.
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