Lithium borohydride → HCID 11328901, compound

Temperature

25 °C

To a solution of methyl N-[(4-bromo-5-chloro thien-2-yl)sulfonyl]-4,4,4,4′,4′,4′-hexafluorovalinate (1.45 g, 2.907 mmol) in THF (20 mL) was added lithium borohydride (LiBH4) (5.82 mL, 11.64 mmol) under N2 atmosphere at 0° C. The reaction was allowed to warm to 25° C. for 19 h. The reaction was cooled to 0° C., quenched with 2N HCl (slow addition), diluted in ether (40 mL) and the organic layer washed sequentially with 1N aqueous HCl (10 mL), saturated aqueous NaHCO3 (10 mL) and brine (15 mL), then dried over MgSO4, filtered and concentrated to obtain a crude oil (1.3 g). The crude product was purified by the Biotage Flash™ 40 chromatography system, eluent: 1:6 EtOAc-hexanes, to afford 4-bromo-5-chloro-N-[3,3,3-trifluoro-1-(hydroxymethyl)-2-(trifluoromethyl)propyl]thiophene-2-sulfonamide as a white solid (1.13 g, 84.32%). Mass Spectrum (−ESI): 469 (M−H)−.

1. temperatureThe reaction was cooled to 0° C.
2. customquenched with 2N HCl (slow addition)
3. additiondiluted in ether (40 mL)
4. washthe organic layer washed sequentially with 1N aqueous HCl (10 mL), saturated aqueous NaHCO3 (10 mL) and brine (15 mL)
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated
8. customto obtain a crude oil (1.3 g)
9. customThe crude product was purified by the Biotage Flash™ 40 chromatography system, eluent

ORD record

ord-8393144d2ed94cbf923dfc881bd80e43

Source dataset

uspto-grants-2009_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07547725B2