Lawesson's reagent → Thiazole, 5-methyl-2-(trifluoromethyl)-

Trifluoroacetamidoacetone (8.45 g, 50 mmol) and 20.2 g (50 mmol) of Lawesson's reagent were slurried in 100 mL of benzene and the mixture heated at reflux with stirring for 4-5 hr to obtain a clear solution. This was allowed to cool and was washed with 50 mL of 10 percent aqueous sodium hydroxide solution, dried over magnesium sulfate, and filtered. The resulting solution was kugelrohr distilled at 160° C. and the distillate was distilled through a 40 cm column packed with glass helices (to remove the benzene) until the head temperature began to drop. It was then distilled through a 20 cm Vigreauz column to obtain 5.1 g (61 percent of theory) of the title compound as a pale oil boiling at 138°-141° C.

1. temperaturethe mixture heated
2. temperatureat reflux
3. customto obtain a clear solution
4. temperatureto cool
5. washwas washed with 50 mL of 10 percent aqueous sodium hydroxide solution
6. dry with materialdried over magnesium sulfate
7. filtrationfiltered
8. distillationThe resulting solution was kugelrohr distilled at 160° C.
9. distillationthe distillate was distilled through a 40 cm column
10. customto remove the benzene) until the head temperature
11. distillationIt was then distilled through a 20 cm Vigreauz column

ORD record

ord-11e7f7b9018d4c78bd80d87860352fa5

Source dataset

uspto-grants-1994_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05324837