Triphenylphosphine → HCID 23512311, compound

Participants

Reaction Steps

To a stirred solution of methyl 3-nitro-4-hydroxybenzoate (1.98 g, 10.04 mmol), N-Boc ethanolamine (1.63 g, 10.11 mmol) and PPh3 (3.43 g, 13.08 mmol) in THF (40 mL) was added DIAD (2.57 mL, 13.05 mmol), and the reaction mixture was then heated under reflux overnight. The resulting mixture was evaporated to give a gum. The residual crude gum was dissolved in CH2Cl2 (30 mL) and TFA (30 mL), and the mixture was stirred for 1 hr at room temp. The mixture was concentrated in vacuo and made basic with sat. NaHCO3. The mixture was extracted with CHCl3, washed with brine, and dried over Na2SO4. The solvent was evaporated in vacuo to give the oily residue, which was purified by column chromatography on silica -gel with CHCl3 then CHCl3-MeOH (20:1, v/v) as eluent to give 930 mg (27% for 2 steps ) methyl 3-nitro4-(2-aminoethoxy)benzoate as gum. 1H-NMR (CDCl3) δ 3.16–3.19 (m, 1 H), 3.53–3.57 (m, 1 H), 3.90 and 3.94 (s, 3 H), 3.95–3.98 (m, 1 H), 4.21–4.24 (m, 1 H), 6.89–6.91 and 7.11–7.13 (m, 1 H), 8.03–8.19 and 8.21 (m, 1 H), 8.52 and 8.86 (m, 1 H).

Provenance & Evidence