“…The organic layer was dried over MgSO 4 and concentrated under reduced pressure. The residue was purified by column chromatography on Al 2 O 3 with dichloromethane/hexane (1:6) ; UVvis (CH 2 Cl 2 ): (log ¾) = 289 (4.71), 339 sh (4.04) nm; 1 H NMR (500 MHz, CDCl 3 , RT): ¤ = 7.63 (ddd, J = 1.9, 1.9, 0.4 Hz, 1H, 2¤-H), 7.58 (d,J = 8.6 Hz,2H,2,7.54 (d,J = 8.6 Hz,2H,3,7.41 (ddd,J = 7.7,1.9,1.9 Hz, 1H, 4¤-H), 7.39 (ddd, J = 7.7, 6.9, 0.4 Hz, 1H, 5¤-H), 7.34 (ddd, J = 6.9, 1.9, 1.9 Hz, 1H, 6¤-H), 3.79 (q, J = 7.1 Hz, 4H, 3¤-N 3 Et 2 ), 1.28 (t, J = 7.1 Hz, 6H, 3¤-N 3 Et 2 ), 1.14 (s, 21H, TIPS) ppm; 13 C NMR (125 MHz, CDCl 3 , RT): ¤ = 151.77 (C-3¤), 141.27 (C-1), 140.97 (C-1¤), 132.34 (C-3,5) Si: C,74.77;H,9.06;N,9.69. Found: C,74.36;H,8.64;N,9.67.…”