Methylparaben → Methyl 4-[1-(tert-butoxycarbonyl)-4,4-difluoro-2-pyrrolidinylmethoxy]benzoate

Participants

Reaction Steps

To a stirred mixture of 1-(tert-butoxycarbonyl)-4,4difluoro-2-pyrrolidinylmethanol (600 mg, 2.53 mmol), methyl 4-hydroxybenzoate (462 mg, 3.03 mmol), Ph3P (795 mg, 3.03 mmol) in THF (10 ml) was added DIAD (597 ul, 3.03 mmol) at room temperature. The mixture was heated at reflux for 3 h with stirring. After cooling to room temperature, the mixture was concntrated in vacuo. The residue was chromatographed on silica gel with hexane-EtOAc (4:1) as eluent to give methyl 4-[1-(tert-butoxycarbonyl)-4,4-difluoro-2-pyrrolidinylmethoxy]benzoate (831 mg, 88%) as a colorless oil. 1H-NMR (CDCl3) δ 1.48 (s, 9 H), 2.53–2.61 (m, 2 H), 3.63–4.41 (series of m, total 8 H), 6.94 (d, J=8.8 Hz, 2H), 7.99(d, J=8.8 Hz, 2H).

Provenance & Evidence