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The O-alkylation procedure described for 190 was used. To a suspension of 4,4′-(cycloheptylidenemethanediyl)diphenol (189) (0.510 g, 1.74 mmol), K2CO3 (0.300 g, 2.17 mmol), and acetone (75 mL) was added ethyl 2-bromo-2-methylpropanoate (0.0.382 mL, 2.6 mmol) at RT. The reaction mixture was refluxed for 48 h and filtered. The filtrate was concentrated and purified to afford 0.320 g (45%) of the title compound 225 as a white foam. In addition, 0.210 g of unreacted starting material was recovered. 1H NMR (300 MHz, CD3OD): δ 7.02 (d, J=1.8 Hz, 2H), 6.99 (d, J=2.1 Hz, 2H), 6.76 (d, J=1.5 Hz, 2H), 6.73 (d, J=1.5 Hz, 2H), 4.71 (br s, 1H), 4.24 (q, J=7.2 Hz, 2H), 2.30 (br d, J=3.3 Hz, 4H), 1.59 (s, 6H), 1.58 (br s, 8H), 1.24 (t, J=6.9 Hz, 3H). LCMS (ESI): m/z 407 (M−H)−.

1. temperatureThe reaction mixture was refluxed for 48 h
2. filtrationfiltered
3. concentrationThe filtrate was concentrated
4. custompurified