4-Methylthiazole → HCID 66811276, compound

Temperature

-78 °C

A solution of 4-methylthiazole (4.0 g, 40.33 mmol) in THF (80 mL) was cooled to −78° C. under nitrogen. n-Butyl lithium (20.4 mL of 2M in hexanes, 40.8 mmol) was added to the reaction mixture slowly over 3 minutes. The reaction mixture was stirred for about 1.5 hours at −78° C., and then 2-fluoronitrobenzene (6.24 g, 44.23 mmol) was added. After stirring at −78° C. for another 30 minutes, the reaction mixture was allowed to warm to room temperature. The reaction mixture was stirred for about 2 hours at room temperature and then the reaction was quenched with water (70 mL). The mixture was extracted with ethyl acetate and the combined organic layers were washed with brine (10 mL), dried (MgSO4), filtered and concentrated. The product was isolated by silica gel chromatography (5-10% ethyl acetate in hexanes) to give the title compound as an orange/brown oil (1.5 g). MS m/z: [M+H+] calcd for C10H8N2O2S 221.03; found 221. Retention time (HPLC 2-90)=4.54

1. stirringAfter stirring at −78° C. for another 30 minutes
2. temperatureto warm to room temperature
3. stirringThe reaction mixture was stirred for about 2 hours at room temperature
4. customthe reaction was quenched with water (70 mL)
5. extractionThe mixture was extracted with ethyl acetate
6. washthe combined organic layers were washed with brine (10 mL)
7. dry with materialdried (MgSO4)
8. filtrationfiltered
9. concentrationconcentrated
10. customThe product was isolated by silica gel chromatography (5-10% ethyl acetate in hexanes)

ORD record

ord-0c7b9594c0b84739affedac90ea4958e

Source dataset

uspto-grants-2012_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08143277B2