Ethylene Oxide → HCID 67273922, compound

A solution of 2-bromo-3-methylthiophene (35.4 g, 200 mmol, ALFA) in diethyl ether (200 mL) was added drop wise to Mg turnings (5.35 g, 220 mmol) over ˜30 min at such a rate as to maintain gentle reflux (at the beginning the reaction was initiated with 2 drops of Br2). After refluxing for 1 h, 2.0M ethylene oxide in THF (150 mL, 300 mmol) was added drop wise at 0° C. over 1 h and stirring was continued at rt for 20 h. After cooling to 0° C. acetyl chloride (22.8 mL, 320 mmol) was added drop wise at 0° C. over 15 min an the suspension was stirred at rt for 18 h. The reaction mixture was diluted with diethyl ether (200 mL) and washed with 1M HCl (200 mL) and 10% brine (200 mL). The aqueous layers were extracted with diethyl ether (100 mL) and the combined organic layers were dried (Na2SO4) and evaporated affording 49 g brownish oil which was purified by distillation affording 32.8 g (89.0%, GC 96.4%) colorless oil, bp ˜120° C./10 mbar.

1. temperatureto maintain gentle
2. temperaturereflux (at the beginning the reaction
3. temperatureAfter refluxing for 1 h
4. additionwas added drop wise at 0° C. over 15 min an the suspension
5. stirringwas stirred at rt for 18 h
6. washwashed with 1M HCl (200 mL) and 10% brine (200 mL)
7. extractionThe aqueous layers were extracted with diethyl ether (100 mL)
8. dry with materialthe combined organic layers were dried (Na2SO4)
9. customevaporated

ORD record

ord-0f08b095f60946daa90226de626075a0

Source dataset

uspto-grants-2011_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07973051B2