反应详情

The O-alkylation procedure described for 190 was used. A round-bottom flask was charged with 4,4′-(cycloheptylidenemethanediyl)diphenol (189) (0.882 g, 3 mmol), K2CO3 (0.518 g, 3.75 mmol) and acetone (100 mL). To the above mixture ethyl 4-bromobutanoate (0.644 mL, 4.5 mmol) was added at room RT and the mixture was refluxed for 24 h. Regular work-up and purification by column chromatography afforded 0.400 g (33%) of the title compound 217 as a white solid and 0.560 g (36%) of dialkylated product. 0.125 g unreacted of SM was also recovered. 1H NMR (300 MHz, CDCl3): δ 7.06 (d, J=8.4 Hz, 2H), 7.02 (d, J=8.4 Hz, 2H), 6.81 (d, J=8.7 Hz, 2H), 6.75 (d, J=8.4 Hz, 2H), 5.40 (s, 1H), 4.17 (q, J=14.1 Hz, 6.9 Hz, 2H), 4.00 (t, J=6.0 Hz, 2H), 2.54 (t, J=7.2 Hz, 2H), 2.34 (br s, 4H), 2.12 (quintet, J=13.2 Hz, J2=6.9 Hz, 2H), 1.59 (s, 8H), 1.28 (t, J=7.2 Hz, 3H). LCMS (ESI): m/z 407 (M−H)−.

1. temperaturethe mixture was refluxed for 24 h
2. customRegular work-up and purification by column chromatography