反应详情

The compound of Example 6 (5.0 gm) was heated in refluxing benzene (30 ml) containing 4-chlorostyrene (7.0 ml). Addition of a benzene (10 ml) solution of triethylamine(7.5 ml) was followed by one hour of continued heating. The cooled mixture was filtered, rotovapped, and dried on the vacuum pump to remove excess styrene. The residual solid was recrystallized from hexane/benzene (charcoal) to give the title compound (6.3 gm); m.p.: 128° to 130° C. NMR (CDCl3) 7.3-6.9 (m, 8H, ArH), 5.4 (dd, 1H, CH), 4.3 (q, 2H, OCH2), 3.8 (m, 1H, CH), 3.0 (m, 1H, CH), 1.38 (t, 3H, CH3).

1. filtrationThe cooled mixture was filtered
2. customdried on the vacuum pump
3. customto remove excess styrene
4. customThe residual solid was recrystallized from hexane/benzene (charcoal)