N,N,N',N'-Tetramethylethylenediamine → 2-Bromo-6-tert-butylthiophenol

Temperature

0 °C

To a solution of tetramethylethylenediamine (198.4 mmol, 30 mL) in cyclohexane (140 mL) is slowly added n-BuLi (198.4 mmol, 99.2 mL; 2M solution in cyclohexane) at 23° C. The resulting solution is cooled to 0° C. A solution of 2-tert-butylthiophenol (15.0 g, 90.2 mmol) in cyclohexane (40 mL) is then added at a rate such that the temperature stays below 10° C. The reaction is then stirred at 0° C. for 5 h and is then allowed to warm to 23° C. overnight. To the resulting yellow solution at 23° C. is added sec-BuLi (90.2 mmol, 69.4 mL of 1.3M solution in cyclohexane) over 0.5 h. The resulting solution gradually turns orange. After 1.5 h, the orange, cloudy reaction mixture is cannulated into a stirring solution of 1,2-dibromotetrafluoroethane (180.4 mmol, 21.5 mL) in THF (50 mL) over 1 h. After addition is complete, the resulting reaction mixture is quenched with 1N HCl (80 mL), and extracted with hexanes (3×100 mL). The hexanes are dried (MgSO4) and evaporated to a dark oil (29.48 g). This oil is taken up in 1N NaOH (100 mL), and extracted with CH2 Cl2 (3×50 mL). The organic phase is discarded, and the aqueous phase is acidified with 12N HCl, and extracted with CH2Cl2 (3×100 mL). The organic phase is dried (MgSO4) and evaporated to provide the title compound as a yellow oil.

1. customat 23° C
2. customstays below 10° C
3. temperatureto warm to 23° C. overnight
4. waitAfter 1.5 h
5. customthe orange, cloudy reaction mixture
6. additionAfter addition
7. customthe resulting reaction mixture
8. customis quenched with 1N HCl (80 mL)
9. extractionextracted with hexanes (3×100 mL)
10. dry with materialThe hexanes are dried (MgSO4)
11. customevaporated to a dark oil (29.48 g)
12. extractionextracted with CH2 Cl2 (3×50 mL)
13. extractionextracted with CH2Cl2 (3×100 mL)
14. dry with materialThe organic phase is dried (MgSO4)
15. customevaporated

ORD record

ord-e1db080cad584b6c8df35d9a95c68f97

Source dataset

uspto-grants-1997_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05684041