Thiophene → (S)-2-(2-methylbutyl)thiophene

Temperatur

-78 °C

A solution of thiophene (10.6 g, 0.13 mol) in dry THF (100 mL) was cooled to −78° C. under nitrogen. A solution of n-BuLi (28.0 mL, 2.5 M, 70.0 mmol) was then added dropwise. After addition, the reaction mixture was stirred at −78° C. for additional 1 hour, before a solution of (S)-2-methylbutyliodide (10.0 g, 50.5 mmol) in dry THF (20 mL) was added slowly. This mixture was stirred at −78° C. for 1 hour, and then allowed to warm to room temperature slowly and stirred at room temperature overnight. The reaction was quenched by water and the mixture was poured into water (100 mL), and the resulting mixture was extracted with ether (300 mL). The organic layer was washed with water and brine, dried over MgSO4, and concentrated on a rotary evaporator. The residue was subjected to column chromatography on silica gel with hexane as the eluent, leading to a colorless oil as the product (4.27 g, 54.8%).

1. additionAfter addition
2. additionwas added slowly
3. temperatureto warm to room temperature slowly
4. stirringstirred at room temperature overnight
5. customThe reaction was quenched by water
6. additionthe mixture was poured into water (100 mL)
7. extractionthe resulting mixture was extracted with ether (300 mL)
8. washThe organic layer was washed with water and brine
9. dry with materialdried over MgSO4
10. concentrationconcentrated on a rotary evaporator

ORD-Eintrag

ord-54f7af10dc024738afc1821ea44597e5

Quelldatensatz

uspto-grants-2013_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08598575B2