Dimethylformamide → HCID 53271813, compound

A solution of 5-(4-fluorophenyl)thiazole (0.5 g, 2.78 mmol) and THF (40 mL) was cooled to −78° C., 1.6 M n-BuLi in hexanes (0.7 mL, 8.36 mmol) was slowly added, the solution was stirred for 20 min and DMF in THF (20 mL) was added. The reaction mixture was stirred at −78° C. for 2 h, quenched with saturated ammonium chloride solution and diluted with ethyl acetate (150 mL). The organic layer was separated, washed with ammonium chloride (3×150 mL) and followed by brine solution (2×100 mL). The organic layer was dried over sodium sulfate, filtered and concentrated under reduced pressure to obtain crude product. The crude product was purified by column chromatography (100-200μ silica gel and 18% ethyl acetate in hexane) to obtain 5-(4-fluorophenyl)thiazole-2-carbaldehyde as off-white solid (0.4 g, 69% yield). 1H NMR (400 MHz, DMSO-d6): δ 9.91 (s, 1H), 8.63 (s, 1H), 7.88-7.91 (m, 2H), 7.35 (t, 2H), LC-MS m/z calculated for [M+H]+ 208.02 found 208.1.

1. stirringThe reaction mixture was stirred at −78° C. for 2 h
2. customquenched with saturated ammonium chloride solution
3. additiondiluted with ethyl acetate (150 mL)
4. customThe organic layer was separated
5. washwashed with ammonium chloride (3×150 mL)
6. dry with materialThe organic layer was dried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customto obtain crude product
10. customThe crude product was purified by column chromatography (100-200μ silica gel and 18% ethyl acetate in hexane)

ORD record

ord-8bcd75fcdf81452a963197146d81d1a8

Source dataset

uspto-grants-2016_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09266873B2