2-(Dimethylamino)ethanol → 2-Methoxy-6-(tributylstannyl)pyridine

온도

2.5 °C

To a solution of 2-dimethylaminoethanol (3.50 mL, 16.36 mmol) in hexane (20.0 mL, HPLC grade) cooled at −5° C. was added drop wise n-BuLi (3.60 M, 9.0 mL, 32.40 mmol) under nitrogen atmosphere. After 30 min at 0° C., 2-methoxy-pyridine (0.60 g, 5.45 mmol) in hexane (20.0 mL) was added drop wise. After stirring the reaction mixture for 1 h at 0-5° C., the reaction medium was cooled to −78° C. followed by drop wise addition of tributyl tin chloride (3.70 mL, 13.62 mmol). The resulting reaction mixture was stirred at −78° C. for 30 min and then allowed to stir at 0-5° C. for 30 min. The reaction mixture was then allowed to come to room temperature. After the completion of reaction (TLC monitoring), the reaction mass was cooled to 0° C. and water was added slowly. The aqueous phase was extracted with diethyl ether (3×50 mL). The combined organic layers were dried over anhydrous Na2SO4, and evaporated to dryness. The crude residue (1.80 g, 72%) was carried forward to the next step without further purification.

1. temperaturethe reaction medium was cooled to −78° C.
2. customThe resulting reaction mixture
3. stirringwas stirred at −78° C. for 30 min
4. stirringto stir at 0-5° C. for 30 min
5. customto come to room temperature
6. customAfter the completion of reaction (TLC monitoring)
7. temperaturethe reaction mass was cooled to 0° C.
8. extractionThe aqueous phase was extracted with diethyl ether (3×50 mL)
9. dry with materialThe combined organic layers were dried over anhydrous Na2SO4
10. customevaporated to dryness
11. customThe crude residue (1.80 g, 72%) was carried forward to the next step without further purification

ORD 기록

ord-0ffbc4709d584fbbbcbb22d89f0e0312

출처 데이터셋

uspto-grants-2013_07

DOI

10.6084/m9.figshare.5104873.v1

특허 번호

US08481544B2