N-Fluorobenzenesulfonimide → 4-Chloro-5-fluoro-7H-pyrrolo(2,3-d)pyrimidine

A solution of 4-chloro-5-bromo-7H-pyrrolo[2,3-d]pyrimidine (800 mg, 3.45 mmol) in THF (50 mL) at −78° C. was treated with n-BuLi (1.6 M in hexane, 2.2 eq, 7.6 mmol, 4.7 mL) dropwise, and stirred for 30 minutes at the same temperature. The mixture was treated with a solution of ACCUFLUOR® NFSi (2.0 eq, 7 mmol, 2.2 g) in THF (10 mL). The reaction mixture was allowed to warm to room temperature, was stirred for 10 h, and then concentrated to dryness. The residue was dissolved in EtOAc (100 mL), washed with water (3×15 mL) and brine (15 mL), dried with Na2SO4, and purified by reverse phase HPLC (10×250 mm C18 Luna column, 4.7 mL/min, 10-90% acetonitrile in water over 20 min) to provide intermediate compound 1. ESI-MS m/z=172.1 (MH+).

1. stirringwas stirred for 10 h
2. concentrationconcentrated to dryness
3. dissolutionThe residue was dissolved in EtOAc (100 mL)
4. washwashed with water (3×15 mL) and brine (15 mL)
5. dry with materialdried with Na2SO4
6. custompurified by reverse phase HPLC (10×250 mm C18 Luna column, 4.7 mL/min, 10-90% acetonitrile in water over 20 min)

ORD record

ord-ac18d767d9b44cf08d706b426a978259

Source dataset

uspto-grants-2013_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

USRE044599E1