Water → 6-Bromo-4-chlorothieno(3,2-d)pyrimidine

Temperature

-78 °C

Lithum diisopropylamine (25 ml, 61.54 mmol) was added to 200 ml of tetrahydrofuran and after lowering the temperature to −78° C., 4-chloro-thieno[3,2-d]pyrimidine (5 g, 39.30 mmol) dissolved in 50 ml of tetrahydrofuran was slowly added into the mixture. After 20 minutes, 1,2-dibromo-1,1,2,2-tetrafluoroethane (11.45 g, 35.17 mmol) was slowly added. After 20 minutes of stirring at −78° C., the temperature was raised to room temperature and the stirring was continued for 2 hours further. The reaction mixture was added with water and extracted with chloroform (3×300 ml), then dried using anhydrous magnesium sulfate. After concentrated under vacuum, it was triturated with 200 ml of n-hexane and the title compound (6.5 g, 89.2%) was obtained as a dark brown solid.

1. customto −78° C.
2. additionwas slowly added into the mixture
3. temperaturethe temperature was raised to room temperature
4. waitthe stirring was continued for 2 hours
5. extractionextracted with chloroform (3×300 ml)
6. customdried
7. concentrationAfter concentrated under vacuum, it
8. customwas triturated with 200 ml of n-hexane

ORD record

ord-1a867b8fc8e64021b6834d28256aec90

Source dataset

uspto-grants-2015_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09062066B2