Hydrochloric Acid → 4-Bromo-2-(cyclopropylmethyl)thiophene

Temperature

160 °C

(4-bromo-2-thienyl)(cyclopropyl)methanone (1.02 g, 4.4 mmol) was diluted in ethylene glycol (3.75 mL). Potassium hydroxide (809 mg, 14.4 mmol, 3.3 eq) and hydrazine hydrate (0.58 mL, 18 mmol, 4.2 eq) were added, and the reaction mixture was heated at 160° C. for 45 minutes behind a blast shield. The reaction was cooled to room temperature, water was added, and the pH adjusted to acidic (by pH paper) with 6M aqueous HCl. The mixture was extracted with dichloromethane, the combined organics dried over sodium sulfate, filtered, and concentrated. The crude product was purified by isco combiflash, eluting with 0-10% ethyl acetate in hexanes. The title compound was obtained as clear colorless oil (50 mg, 5%).

1. temperatureThe reaction was cooled to room temperature
2. extractionThe mixture was extracted with dichloromethane
3. dry with materialthe combined organics dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated
6. customThe crude product was purified by isco combiflash
7. washeluting with 0-10% ethyl acetate in hexanes

ORD record

ord-366ee0119e0f49d7b0457377c39b5e6c

Source dataset

uspto-grants-2013_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08372875B2