反应详情

A solution of pentafluorophenyl 3-chloro-4-[(1-methylethyl)oxy]benzoate (0.100 g, 0.263 mmol) in methanol (5.0 mL) was treated with 3-hydrazinopropanenitrile (0.023 mL, 0.289 mmol) and heated to reflux for 1 h. Following cooling, 4-(benzyloxy)benzaldehyde (0.067 g, 0.315 mmol), sodium cyanoborohydride (0.020 g, 0.315 mmol), and p-toluenesulfonic acid monohydrate (0.060 g, 0.315 mmol) were added and the solution stirred 30 min. at ambient temperature. Additional 4-(benzyloxy)benzaldehyde (0.067 g, 0.315 mmol), sodium cyanoborohydride (0.040 g, 0.637 mmol), and p-toluenesulfonic acid monohydrate (0.100 g, 0.526 mmol) were added and the solution stirred overnight at ambient temperature. The reaction was quenched with 6N aqueous NaOH, diluted with brine, and extracted thrice with EtOAc. The organic layer was dried over MgSO4, filtered, and concentrated in vacuo. Purification via flash column chromatography (30-80% EtOAc/hexanes) gave the title compound as a white solid (0.077 g; 61%). 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 7.61 (d, J=2.3 Hz, 1 H) 7.45 (dd, J=8.8, 2.2 Hz, 2 H) 7.42 (s, 1 H) 7.36-7.41 (m, 2 H) 7.32 (tt, J=7.0, 1.8 Hz, 1 H) 7.28 (s, 1 H) 7.17 (br. s., 1 H) 6.94 (d, J=8.6 Hz, 2 H) 6.88 (d, J=8.6 Hz, 1 H) 5.05 (s, 2 H) 4.61 (qq, J=6.0 Hz, 1 H) 4.22 (s, 2 H) 3.39 (t, J=6.6 Hz, 2 H) 2.60 (t, J=6.6 Hz, 2 H) 1.39 (d, J=6.1 Hz, 6 H) 4.22 (s, 2 H) 3.39 (t, J=6.6 Hz, 2 H) 2.60 (t, J=6.6 Hz, 2 H) 1.39 (d, J=6.1 Hz, 6 H). MS(ES+) m/e 478 [M+H]+.

1. temperatureheated
2. temperatureto reflux for 1 h
3. temperatureFollowing cooling
4. stirringthe solution stirred overnight at ambient temperature
5. customThe reaction was quenched with 6N aqueous NaOH
6. additiondiluted with brine
7. extractionextracted thrice with EtOAc
8. dry with materialThe organic layer was dried over MgSO4
9. filtrationfiltered
10. concentrationconcentrated in vacuo
11. customPurification via flash column chromatography (30-80% EtOAc/hexanes)