Hydrochloric Acid → 1-Tert-butyl-1,3-dihydro-benzimidazol-2-one

To a solution of tert-butyl-(2-nitrophenyl)-amine (1.27 g, 6.5 mmol), 5% palladium on carbon (0.5 g), and sodium borohydride (0.49 g, 13.1 mmol) in tetrahydrofuran (20 mL) was added methanol (10 mL) in a dropwise manner. Upon completion of the reaction, it was filtered through a pad of Celite and the filtrate was poured into a saturated aqueous solution of ammonium chloride (50 mL), and extracted with ethyl acetate (50 mL). The organic layer was dried over anhydrous magnesium sulfate, concentrated in vacuo to give N-tert-butyl-benzene-1,2-diamine which was used in the next step without further purification. A solution of N-t-butyl-benzene-1,2-diamine (1.1 g, 6.7 mmol) and carbonyldiimidazole (1.63 g, 10 mmol) in anhydrous tetrahydrofuran (50 mL) was stirred at room temperature for 12 hours. Upon completion, the reaction was poured into a 1 N aqueous solution of hydrochloric acid (50 mL) and extracted with ethyl acetate (50 mL). The organic layer was dried over anhydrous sodium sulfate and concentrated in vacuo. The crude product was purified via flash column chromatography (silica, 50% ethyl acetate in hexane) to give 1-tert-butyl-1,3-dihydro-benzimidazol-2-one as an off-white solid. MS (ES) m/z 191.1.

1. customwas used in the next step without further purification
2. extractionextracted with ethyl acetate (50 mL)
3. dry with materialThe organic layer was dried over anhydrous sodium sulfate
4. concentrationconcentrated in vacuo
5. customThe crude product was purified via flash column chromatography (silica, 50% ethyl acetate in hexane)

ORD record

ord-6c5a08f073984a2cae22def4a9b4b6fd

Source dataset

uspto-grants-2009_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07517899B2