Trimethyl orthoformate → Tert-butyl 5-chloro-[1,2,4]triazolo[4,3-a]pyridine-7-carboxylate
Reaktionsgleichung
[CH:1](OC)(OC)OC.[Cl:8][C:9]1[CH:10]=[C:11]([CH:19]=[C:20]([NH:22][NH2:23])[N:21]=1)[C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13]>>[Cl:8][C:9]1[N:21]2[CH:1]=[N:23][N:22]=[C:20]2[CH:19]=[C:11]([C:12]([O:14][C:15]([CH3:18])([CH3:16])[CH3:17])=[O:13])[CH:10]=1Komponenten
3
Reaktionsbedingungen
- Temperatur
- 85 °C
Versuchsvorschrift
Trimethyl orthoformate (100 mL, 903 mmol) was added neat to tert-butyl 2-chloro-6-hydrazinoisonicotinate (10.0 g, 41.0 mmol). The mixture was heated to 85° C. After 5 h, the mixture was cooled to ambient temperature and concentrated. Purification by silica gel chromatography (100% hexanes→50% hexanes/ethyl acetate) gave the title compound (4.55 g): LC-MS [M+1]=254.1.