Trifluoroacetic acid → Silane, tris(1-methylethyl)-

To a solution of (2,6-dimethyl-4-triisopropylsilanyloxy-phenyl)-(4-fluoro-3-iso-propyl-phenyl)-methanol (520 mg, 1.08 mmol) in CH2Cl2 (10 mL)was added TFA (1.53 M, 0.7 mL) followed by triethylsilane (0.6 mL, 3.77 mmol) at r.t. After stirring for 2 h, the reaction mixture was diluted with EtOAc and water and the layers were separated. The aqueous layer was further extracted with EtOAc. The combined organic layers were washed with Sat. NaHCO3, water and brine, dried over MgSO4, filtered and concentrated. The residue was purified by column chromatography (silica gel, hexanes) to provide 3,5-dichloro-4-(4′-fluoro-3′-iso-propyl-benzyl)-phenoxy]-triisopropylsilane as a colorless liquid (360 mg, 72%): 1H NMR (300 MHz, CDCl3): δ 7.11 (m, 1H), 6.91 (m, 4H), 4.21 (s, 2H), 3.19 (m, 1H), 1.24 (m, 3H), 1.17 (m, 24H). TLC conditions: Uniplate silica gel, 250 microns; Mobile phase=hexanes; Rf=0.68.

1. customthe layers were separated
2. extractionThe aqueous layer was further extracted with EtOAc
3. washThe combined organic layers were washed with Sat. NaHCO3, water and brine
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated
7. customThe residue was purified by column chromatography (silica gel, hexanes)

ORD record

ord-3374053d6fac40d8ac3c5597b5ffa2b5

Source dataset

uspto-grants-2010_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07829552B2