[N:1]1[CH:6]=[CH:5][CH:4]=[C:3]([CH:7]=O)[CH:2]=1.[C:9](=[O:16])([O:11][C:12]([CH3:15])([CH3:14])[CH3:13])[NH2:10].[C:17]1([S:23]([O-:25])=[O:24])[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1.[Na+].C(O)=O>O.CO>[C:17]1([S:23]([CH:7]([NH:10][C:9](=[O:16])[O:11][C:12]([CH3:15])([CH3:14])[CH3:13])[C:3]2[CH:2]=[N:1][CH:6]=[CH:5][CH:4]=2)(=[O:25])=[O:24])[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1Pyridine-3-carbaldehyde (5.36 g, 50 mmol), tert-butyl carbamate (11.7 g, 100 mmol, 2 equivalents), sodiumphenylsulfinate (20.36 g, 124 mmol, 2.48 equivalents), formic acid (1.89 ml, 2.30 g, 1 equivalent), methanol (55 ml) and water (111 ml) are mixed and vigorously stirred at room temperature for 3 d. The product precipitates in the form of colorless crystals which are collected by filtration, washed with water and a little MTBE and dried in vacuo. Yield: 4.10 g (24% of theory).
Wird geladen…