Dimethylformamide dimethyl acetal → HCID 178423428、化合物

温度

90 °C

2-Chloro-6-methyl-isonicotinamide (1.23 g) and N,N-dimethylformamide dimethyl acetal (1.05 ml) were dissolved in dry DMF (4 ml) under inert atmosphere and the resulting solution was heated to 90° C. and stirred for 1 h. The reaction mixture was cooled to room temperature and a solution of hydrazine acetate (3.32 g) in acetic acid (8 ml) was dropwise added. The mixture was heated to 90° C. and stirred for 1 h. The solvent was removed under reduced pressure and the residue partitioned between saturated aqueous solution of NaHCO3 and EtOAc. The organic phase was separated, washed with brine, dried under Na2SO4, filtered and the solvent was evaporated under reduced pressure. The crude was purified by flash column chromatography (10 g Isolute® silica gel cartridge; gradient elution: hexane/EtOAc from 1/1 to 3/7) affording 2-Chloro-6-methyl-4-(1H-[1,2,4]triazol-3-yl)-pyridine (0.92 g). GC (Rt)=13.21 min (method=3A)

1. temperatureThe reaction mixture was cooled to room temperature
2. temperatureThe mixture was heated to 90° C.
3. stirringstirred for 1 h
4. customThe solvent was removed under reduced pressure
5. customthe residue partitioned between saturated aqueous solution of NaHCO3 and EtOAc
6. customThe organic phase was separated
7. washwashed with brine
8. customdried under Na2SO4
9. filtrationfiltered
10. customthe solvent was evaporated under reduced pressure
11. customThe crude was purified by flash column chromatography (10 g Isolute® silica gel cartridge; gradient elution: hexane/EtOAc from 1/1 to 3/7)

ORDレコード

ord-2dca4ae63771481594945def71eabcb5

出典データセット

uspto-grants-2014_02

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08653075B2