2-Bromopyridine → HCID 17966048, compound

Under nitrogen, a stirred solution of 2-bromopyridine (843 g, 5.33 mol) and triisopropylborate (1.20 kg, 6.40 mol) in THF (6.74 l) was cooled to −75° C. A 1.6M solution of n-BuLi in hexanes (4.00 l, 6.40 mol) was added at such a rate that the temperature did not exceed −67° C. After completion of the addition, the reaction was allowed to warm to room temperature and stirred at this temperature for 16 hours. After this time, a solution of N-phenyldiethanolamine (966 g, 5.33 mol) in THF (966 ml) was added and the resulting mixture heated at reflux for 4 hours. The solvent was distilled and replaced with isopropanol until the head temperature was 76° C. (distilling 11.3 l and adding in 8.4 l of isopropanol during the process). The mixture was cooled to room temperature and stirred at this temperature for 12 hours. The mixture was filtered, the solid washed with isopropanol (1.7 l) and dried in vacuo overnight at 40° C. to give 1605 g of the subtitle compound. Analysis by 1H NMR showed a ratio of pyridine: N-phenyldiethanolamine (or lithium alkoxide): isopropyl of 1:1.25:1.55.

1. customdid not exceed −67° C
2. additionAfter completion of the addition
3. temperaturethe resulting mixture heated
4. temperatureat reflux for 4 hours
5. distillationThe solvent was distilled
6. customwas 76° C.
7. distillationdistilling 11.3 l
8. additionadding in 8.4 l of isopropanol during the process)
9. temperatureThe mixture was cooled to room temperature
10. stirringstirred at this temperature for 12 hours
11. filtrationThe mixture was filtered
12. washthe solid washed with isopropanol (1.7 l)
13. customdried in vacuo overnight at 40° C.

ORD record

ord-1bfaa2219a8a4d69b660dbcaaaa6f31f

Source dataset

uspto-grants-2006_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07026479B2