HCID 22272691, compound → HCID 3020287, compound

Temperature

60 °C

To a solution of 4-chloro-6-isopropyl-3-methyl-2-nitrophenol (1.82 g, 7.92 mmol) obtained in Example 97 in ethanol (40 ml) was added 10% palladium carbon catalyst (1.8 g) and the mixture was stirred under hydrogen atmosphere at 60° C. for 3 hours. After the reaction was over, the reaction solution was filtered with celite and the filtrate was concentrated to provide 1.60 g of 2-amino-6-isopropyl-3-methylphenol (yield 99%) as pale brown solid. To a solution of this aminophenol (1.65 g, 7.92 mmol) in ethanol (25 ml) was added potassium O-ethyl dithiocarbonate (1.52 g, 9.50 mmol) and the mixture was heated to reflux for 8 hours and the solvent was evaporated. The resulting residue was dissolved in water, acidified to pH, 3-4 with 2 N hydrochloric acid and extracted with ethyl acetate. The organic layer was washed with water, a saturated sodium chloride solution successively, dried over anhydrous magnesium sulfate and concentrated in vacuo. The resulting residue was crystallized from ethyl acetate-hexane to provide 0.99 g (yield 60%) of 7-isopropyl-2-mercapto-4-methylbenzoxazole as pale yellow needles.

1. filtrationwas filtered with celite
2. concentrationthe filtrate was concentrated

ORD record

ord-55917a85831a425d8f00ba54d481444f

Source dataset

uspto-grants-2005_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06969711B2