Hydrochloric Acid → 2-Chloro-N-ethyl-6-(1,1-dimethylethyl)benzamide

Temperature

-30 °C

To a solution of 2-tert-butyl-N-ethylbenzamide (44 g, 215 mmol) and TMEDA (70 mL, 446 mmol) in 500 mL THF at −70° C. under a positive nitrogen atmosphere was added at a rapid stream 520 mL 1.3M s-BuLi in cyclohexane, maintaining the temperature at below −60° C. After the addition was complete, the resulting reaction solution was warmed to −30° C. and stirred at between −30° C. and −26° C. for 50 min. The solution was then cooled to below −70° C. and a solution of hexachloroethane (80 g) in 250 mL THF was added at between −70 and −65° C. Stirring at below −70° C. was continued for 0.5 h. The resulting reaction solution was then poured into water. CH2Cl2 and 3N HCl were added. The aq layer was separated and extracted with CH2Cl2. The combined organic layers were washed with water, dried and concentrated in vacuo. The solid was triturated with hexane and then purified by flash chromatography with 15% ethyl acetate/hexane as eluent to give the desired product as a white solid. m.p. 121-123° C.

1. temperaturemaintaining the temperature at below −60° C
2. additionAfter the addition
3. customthe resulting reaction solution
4. temperatureThe solution was then cooled to below −70° C.
5. stirringStirring at below −70° C.
6. waitwas continued for 0.5 h
7. customThe resulting reaction solution
8. customThe aq layer was separated
9. extractionextracted with CH2Cl2
10. washThe combined organic layers were washed with water
11. customdried
12. concentrationconcentrated in vacuo
13. customThe solid was triturated with hexane
14. custompurified by flash chromatography with 15% ethyl acetate/hexane as eluent

ORD record

ord-aef2aab6640045a8a7b86652e0d8e499

Source dataset

uspto-grants-2002_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06410558B1