N-Fluorobenzenesulfonimide → 4-Fluoro-1-[tris(1-methylethyl)silyl]-1H-pyrrolo[2,3-b]pyridine

4-Bromo-1-(triisopropylsilyl)-1H-pyrrolo[2,3-b]pyridine (50 g, 141.5 mmol) in THF (2 L) at −78° C. was treated dropwise with tert-butyllithium (166.5 mL, 283.0 mmol, 1.7M in pentane). The reaction was then stirred for 15 minutes. N-Fluoro-N-(phenylsulfonyl)benzenesulfonamide (49.08 g, 155.6 mmol) in THF (200 mL) was then added dropwise, and the mixture was stirred at −78° C. After 2 hours, the reaction was quenched at −78° C. with saturated aqueous NH4Cl (200 mL). The aqueous phase was extracted with hexanes. The combined hexane phases were dried (MgSO4) and passed through a plug of silica gel eluting with hexanes. The combined hexanes fractions were concentrated in vacuo to provide 4-fluoro-1-(triisopropylsilyl)-1H-pyrrolo[2,3-b]pyridine (36.1 g, 87% yield) as an oil. 1H NMR (400 MHz, CDCl3) δ□ 8.18 (dd, 1H), 7.25 (d, 1H), 6.76 (dd, 1H), 1.86-1.81 (m, 3H), 1.13 (d, 18H).

1. stirringthe mixture was stirred at −78° C
2. waitAfter 2 hours
3. customthe reaction was quenched at −78° C. with saturated aqueous NH4Cl (200 mL)
4. extractionThe aqueous phase was extracted with hexanes
5. dry with materialThe combined hexane phases were dried (MgSO4)
6. concentrationThe combined hexanes fractions were concentrated in vacuo

ORD record

ord-19c66571283d42ad8c65069c3324416d

Source dataset

uspto-grants-2014_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08758830B2