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1.05 g (4.12 mmol) 4 and 0.65 g (6.22 mmol) methacryloyl chloride were dissolved in 15 ml of carbon tetrachloride. After the addition of 2.6 g activated molecular sieves (3 Å), the mixture was heated to reflux for 24 h. After cooling down to room temperature, it was filtered over basic alumina using 20% THF in CCl4. Evaporating the solvent yielded 0.8 g (60.1%) of a viscous yellow oil. Rf=0.44 (EtOAc/hexanes: 2/8). 1H NMR (CDCl3, 500 MHz, 20° C.): d 8.10 (t, 2H, J=7.76 Hz), 7.44 (m, 4H), 7.23 (m, 2H), 5.99 (s, 1H), 5.51 (s, 1H), 4.49 (t, 2H, 5.95 Hz), 4.19 (t, 2H, J=4.75 Hz), 3.88 (t, 2H, J=5.95 Hz), 3.59 (t, 2H, J=4.75 Hz), 1.88 (s, 3H). 13C NMR (CDCl3, 125 MHz, 20° C.): d 167.3, 140.6, 136.0, 125.8, 125.7, 122.9, 120.3, 119.0, 108.8, 69.5, 69.3, 63.7, 43.2, 18.2.

1. additionAfter the addition of 2.6 g
2. temperaturethe mixture was heated
3. temperatureto reflux for 24 h
4. filtrationit was filtered over basic alumina using 20% THF in CCl4
5. customEvaporating the solvent