Chlorosuccinimide → HCID 178454146, compound

Temperature

0 °C

[(S)-1-(4-Bromo-5-chloro-1H-imidazol-2-yl)-2-phenyl-ethyl]-carbamic acid tert-butyl ester: To a suspension of 141C (5.0 g, 17 mmol) in acetonitrile (400 mL) at 0° C. was added NCS (2.3 g, 17 mmol). The reaction mixture was stirred at 0° C. for 1 h, then at rt for 1 h followed by 50° C. overnight. The reaction mixture was concentrated and the residue was dissolved in ethyl acetate, washed with water and brine, dried over sodium sulfate, and concentrated. The crude was purified by flash column chromatography to give [(S)-1-(4-chloro-1H-imidazol-2-yl)-2-phenyl-ethyl]-carbamic acid tert-butyl ester as white solid (2 g, 36%). LCMS m/z 321 (M+H)+. To a solution of this intermediate (2 g, 6.20 mmol) in chloroform was added NBS (1.2 g, 6.8 mmol) and the reaction mixture was stirred at rt for 20 min. The reaction was quenched with water. The organic layer was washed with water and brine, dried over sodium sulfate and concentrated. The crude product was purified by crystallization from hexane to give 141D as an off-white solid (1.7 g, 71%). LC/MS m/z 400 (M+H)+. 1HNMR (CDCl3, 400 MHz) δ 7.28 (m, 3H), 7.12 (d, 2H), 5.33 (d, 1H), 4.81 (d, 1H), 3.27 (dd, 2H), 1.3 (s, 9H).

1. waitat rt for 1 h followed by 50° C. overnight
2. concentrationThe reaction mixture was concentrated
3. dissolutionthe residue was dissolved in ethyl acetate
4. washwashed with water and brine
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated
7. customThe crude was purified by flash column chromatography

ORD record

ord-cace14b0d41242daa8f7c51dd7ff8db0

Source dataset

uspto-grants-2012_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08252830B2