Triphenylphosphine → HCID 16093629, compound

Participants

Reaction Steps

To a stirred solution of ethyl 4-hydroxy-3-methoxybenzoate (3.00 g, 15.29 mmol), (S)-N-Boc-prolinol (3.08 g, 15.30 mmol), Ph3P (4.81 g, 18.34 mmol) in THF (50 mL) was added DIAD (3.61 mL, 18.33 mmol) at 0° C. The resulting mixture was heated under reflux 6.5 hr. After cooling to room temp, the mixture was evaporated and purified by column chromatography on silica-gel with CHCl3-MeOH (50:1, v/v) as eluent to give ethyl (S)-3-methoxy-4-[1-(tert-butoxycarbonyl)-2-pyrrolidinyl methoxy]benzoate as a gum. The above ethyl (S)-3-methoxy-4-[1-(tert-butoxycarbonyl)-2-pyrrolidinylmethoxy]benzoate was dissolved in CH2Cl2 (50 mL) and TFA (45 mL). The mixture was stirred for 2 days at room temp. The resulting mixture was concentrated in vacuo and made basic with sat. NaHCO3. The mixture was extracted with CH2Cl2, washed with brine, and dried over MgSO4. The solvent was evaporated and the residue was purified by column chromatography on silica-gel with CHCl3-MeOH (20:1, v/v) as eluent to give 3.27 g (77% for 2 steps) ethyl (S)-3-methoxy-4-(2-pyrrolidinylmethoxy) benzoate as a yellow oil. 1H-NMR (CDCl3) δ 1.39 (t, 3 H, J=7.1 Hz), 1.52–1.59 (m, 1 H), 1.76–1.88 (m, 2 H), 1.92–2.01 (m, 1H), 2.92–3.06 (m, 2 H), 3.56–3.63 (m, 1 H), 3.90 (s, 3 H), 3.91–4.02 (m, 2 H), 4.35 (q, 2 H, J=7.1 Hz), 6.89 (d, 1 H, J=8.3 Hz), 7.54 (d, 1 H, J=2.0 Hz), 7.65 (dd, 1 H, J=2.0, 8.3 Hz).

Provenance & Evidence