Isobutyl iodide → HCID 57539036, compound

Temperature

40 °C

A mixture of benzotriazole (11.91 g, 100 mmol), 1-iodo-2-methylpropane (13.8 mL, 120 mmol), potassium carbonate (41.46 g, 300 mmol), and dimethylformamide (200 mL) was stirred and heated under argon at 40° C. for 2 days. The reaction mixture was poured into ice/water (1 L) and extracted with toluene/hexanes (2:1, 2×500 mL). The extract was washed with 1 N HCl (2×200 mL) followed by brine (100 mL), dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure. The residue was triturated with hexane (200 mL) and set aside at room temperature for 2 hours. The precipitate was separated and discarded, and the solution was filtered through a layer of silica gel (200 g). The silica gel was washed with hexane/dichloromethane/ethyl acetate (37:50:3, 2 L). The filtrate and washings were combined, and the solvent was removed under reduced pressure to give 2-isobutyl-2H-benzo[d][1,2,3]triazole (8.81 g, 50% yield) as an oily product. 1H NMR (400 MHz, CDCl3): δ 7.86 (m, 2H, benzotriazole), 7.37 (m, 2H, benzotriazole), 4.53 (d, J=7.3 Hz, 2H, i-Bu), 2.52 (m, 1H, i-Bu), 0.97 (d, J=7.0 Hz, 6H, i-Bu).

1. extractionextracted with toluene/hexanes (2:1, 2×500 mL)
2. washThe extract was washed with 1 N HCl (2×200 mL)
3. dry with materialdried over anhydrous magnesium sulfate
4. customthe solvent was removed under reduced pressure
5. customThe residue was triturated with hexane (200 mL)
6. customThe precipitate was separated
7. filtrationthe solution was filtered through a layer of silica gel (200 g)
8. washThe silica gel was washed with hexane/dichloromethane/ethyl acetate (37:50:3, 2 L)
9. customthe solvent was removed under reduced pressure

ORD record

ord-006b429bbf1c4b3ebf727ffdd2107011

Source dataset

uspto-grants-2016_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09382424B2