Dimethyl Sulfoxide → 3-chloro-1-(2-methoxy-4-nitrophenyl)-1H-1,2,4-triazole

Step E (2): Iodomethane (0.860 mL, 13.82 mmol) was added to a mixture of 2-(3-chloro-1H-1,2,4-triazol-1-yl)-5-nitrophenol (1.33 g, 5.53 mmol), potassium hydroxide (0.388 g, 6.91 mmol), and DMSO (25 mL). The mixture was left to stir at rt for 24 h. The reaction mixture was poured into water (250 mL) and extracted with EtOAc (3×100 mL). The combined extracts were washed with water, washed with brine, dried over sodium sulfate, filtered and concentrated in vacuo. The crude residue was purified using silica gel column chromatography (0-1% MeOH/chloroform, linear gradient over 72 min, flow 25 mL/min). The pure fractions were combined and concentrated to afford 3-chloro-1-(2-methoxy-4-nitrophenyl)-1H-1,2,4-triazole (0.924 g, 3.63 mmol, 65.6% yield) as a light yellow solid. LC-MS (M+H)+=255.0. 1H NMR (500 MHz, chloroform-d) δ ppm 8.35 (s, 1 H) 7.36 (d, J=8.55 Hz, 1 H) 6.29-6.34 (m, 2 H) 3.80 (s, 3 H) 2.46 (s, 3 H).

1. waitThe mixture was left
2. extractionextracted with EtOAc (3×100 mL)
3. washThe combined extracts were washed with water
4. washwashed with brine
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe crude residue was purified
9. customsilica gel column chromatography (0-1% MeOH/chloroform, linear gradient over 72 min, flow 25 mL/min)
10. concentrationconcentrated

ORD record

ord-7e39a50e754a4e9a81ef6e2101e1450d

Source dataset

uspto-grants-2013_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08349880B2