反应详情

A solution of 1,3-dicyclohexylcarbodiimide (4.23 g, 20.5 mmol), (2S)-2-(6-methoxy(2-naphthyl))propanoic acid (naproxen, 4.34 g, 18.9 mmol), and 2-nitro-2-methyl-1,3-propanediol (2.56 g, 19.0 mmol) in CH2Cl2 (50 mL) and THF (50 mL) was stirred at ambient temperature overnight. The solvent was evaporated and EtOAc (100 mL) was added to the resulting crude material, cooled in a dry-ice bath and the byproduct, dicyclohexyl urea was removed by filtration. The product was separated by silica gel column chromatography eluting with ethyl acetate/hexane (1:3, Rf=0.1) to give the title compound (a mixture of diasteromers) as an oil (2.77 g, 42% yield). 1H NMR (300 MHz, CDCl3) δ 7.69-7.60 (m, 3H), 7.34-7.3 (m, 1H), 7.14-7.08 (m, 2H), 4.44 (d, J=4.2 Hz, 2H), 3.86 (s, 3H), 3.85 (q, J=7.2 Hz, 1H), 3.7 (m, 1H), 1.55 (d, J=7.2 Hz, 3H), 1.36 & 1.40 (s, 3H). 13C NMR (75 MHz, CDCl3) δ 174.14, 174.02, 157.57, 134.53, 134.51, 133.64, 129.13, 128.7, 127.17, 125.87, 125.84, 119.0, 105.47, 89.53, 89.42, 64.67, 64.52, 64.19, 55.12, 45.04, 18.25, 18.03, 17.82, 17.79. Mass spectrum (API-TIS) m/z 348 (MH)+.

1. customThe solvent was evaporated
2. additionEtOAc (100 mL) was added to the resulting crude material
3. temperaturecooled in a dry-ice bath
4. customthe byproduct, dicyclohexyl urea was removed by filtration
5. customThe product was separated by silica gel column chromatography
6. washeluting with ethyl acetate/hexane (1:3, Rf=0.1)