反应详情

A solution of ethyl 2-ethoxycarbonyl-9-phenoxynonanoate (1.84 g, 5.3 mmol) in 20% NaOH (20 mL) was refluxed for 10 h. The solution was acidified with HCl(pH=2) and extracted with ethyl acetate (3×50 mL). The organic phase was washed with water (2×30 mL), and brine (30 mL), and dried over Na2SO4. After removal of the solvent in vacuo, the residue was heated on an oil bath at 180°-200° C. for 10 min. The crude product was distilled (Kugelrohr) followed by crystallization (hexane) to give the product (1.14 g, 85%), mp 66.5°-67.5° C. (lit.3 68°-69° C.). IR: 3450-2550, 1720 cm-1 ; 1H-NMR: 1.26-1.39 (m, 8H), 1.61 (q, 2H), 1.75 (q, 2H), 2.34 (t, 2H), 3.93 (t, 2H), 6.83-6.96 (m, 3H), 7.28 (t, 2H), 10.8 (bs, 1H).

1. extractionextracted with ethyl acetate (3×50 mL)
2. washThe organic phase was washed with water (2×30 mL), and brine (30 mL)
3. dry with materialdried over Na2SO4
4. customAfter removal of the solvent in vacuo
5. temperaturethe residue was heated on an oil bath at 180°-200° C. for 10 min
6. distillationThe crude product was distilled (Kugelrohr)
7. customfollowed by crystallization (hexane)