Diisopropylamine → (5-Bromo-2-fluorophenyl)(6-chloro-2-fluoro-3-(methoxymethoxy)pyridin-4-yl)methanol

Temperature

0 °C

A solution of i-Pr2NH (1100 mL, 7.72 mol) in anhydrous THF (3.5 L) was cooled to −10° C. n-BuLi (2.5 M in hexanes, 3087 mL, 7.72 mol) was added drop wise and the solution was stirred for 10 min at 0° C. The reaction mixture was cooled to −78° C. and a solution of 6-chloro-2-fluoro-3-(methoxymethoxy)pyridine (1344 g, 7.02 mol) in anhydrous THF (2 L) was added slowly, keeping the internal temperature below −60° C. The resulting solution was stirred at −75° C. for 1 hr. A solution of 5-bromo-2-fluorobenzaldehyde (1430 g, 7.02 mol) in THF (1.7 L) was added drowise. After the addition was complete, the reaction mixture was stirred at −75° C. for 30 min. The reaction mixture was warmed to RT and quenched with saturated aqueous NH4Cl solution (3 L). EtOAc (5 L) was added and the mixture was stirred vigorously. After phase separation, the aqueous layer was extracted with EtOAc (3 L×2). The combined organics were washed with brine and dried over anhydrous Na2SO4. The solvent was removed under reduced pressure and the residue was purified by column chromatography (0-10% EtOAc/hexanes) to provide 2128 g of (5-bromo-2-fluorophenyl)(6-chloro-2-fluoro-3-(methoxymethoxy)pyridin-4-yl)methanol as a light yellow solid.

1. additionwas added drop wise
2. temperatureThe reaction mixture was cooled to −78° C.
3. customthe internal temperature below −60° C
4. stirringThe resulting solution was stirred at −75° C. for 1 hr
5. additionAfter the addition
6. stirringthe reaction mixture was stirred at −75° C. for 30 min
7. temperatureThe reaction mixture was warmed to RT
8. customquenched with saturated aqueous NH4Cl solution (3 L)
9. additionEtOAc (5 L) was added
10. stirringthe mixture was stirred vigorously
11. customAfter phase separation
12. extractionthe aqueous layer was extracted with EtOAc (3 L×2)
13. washThe combined organics were washed with brine
14. dry with materialdried over anhydrous Na2SO4
15. customThe solvent was removed under reduced pressure
16. customthe residue was purified by column chromatography (0-10% EtOAc/hexanes)

ORD record

ord-8748f328e1764b5f971d60dfb214412c

Source dataset

uspto-grants-2013_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08497264B2