Triphenylphosphine → HCID 70807891, compound

Participants

Reaction Steps

To a mixture of tert-butyl[(2S)-1-hydroxypropan-2-yl]carbamate (1.07 g, 6.11 mmol), 4-fluoro-2-(trifluoromethyl)phenol (1.10 g, 5.55 mmol) and triphenylphosphine-resin (2.80 g, 8.40 mmol) in tetrahydrofuran (50 mL) was added drop-wise diisopropyl azodicarboxylate (DIAD, 1.37 g, 6.66 mmol). The reaction was allowed to stir at room temperature for 3 days, then filtered and rinsed with ethyl acetate. The combined filtrate was washed with 0.5 N aqueous sodium hydroxide and saturated aqueous sodium chloride solution, dried over magnesium sulfate, filtered and concentrated in vacuo. Purification via silica gel chromatography (50% ethyl acetate in heptane) afforded the title compound as a clear yellow oil. Sample contained some residual diisopropyl azodicarboxylate and carried forward without further purification. Yield: 2.52 g, 134%. LCMS m/z 282.0 {[M-(2-methyl-prop-1-ene)]+1}. 1H NMR (400 MHz, CDCl3) δ 1.31 (d, J=6.8 Hz, 3H), 1.45 (s, 9H), 3.98-4.03 (m, 2H), 4.04-4.13 (m, 1H), 6.95 (dd, J=9.2, 4.2 Hz, 1H), 7.16-7.22 (m, 1H), 7.30 (dd, J=8.3, 3.0 Hz, 1H).

Provenance & Evidence