Reaction Steps
7. To a dry 250 mL round bottom flask under nitrogen was added N1-(4-(3-(tert-butyldimethylsilyloxy)propoxy)phenyl)-N1,N4,N4-tris(4-methoxyphenyl)benzene-1,4-diamine (9.06 g, 13.1 mmol), tetrahydrofuran (12.4 mL), and tetrabutylammonium fluoride (8.21 g, 31.4 mmol). The reaction was allowed to stir at room temperature while being monitored by thin layer chromatography. Upon disappearance of the starting material the reaction mixture was poured into a separatory funnel containing 150 mL of cold water. The product was extracted using 3×75 mL ether. The organic layers were combined and dried over MgSO4. The drying agent was removed by filtration and the solvent was removed under reduced pressure. The material was purified by flash chromatography (silica gel, 1:2 hexanes:ethyl acetate) and recrystallization (methanol) to yield a white solid (5.93 g, 78.6%). 1H NMR (400 MHz, C3D6O) δ 6.97 (m, 8H), 6.85 (m, 8H), 6.81 (s, 4H), 4.07 (t, J=6.3 Hz, 2H), 3.78 (s, 9H), 3.71 (q, J=5.7 Hz, 2H), 3.63 (t, J=5.2 Hz, 2H), 1.93 (q, J=6.3 Hz, 2H). 1H NMR (400 MHz, C3D6O with D2O) δ 6.95 (m, 8H), 6.84 (m, 8H), 6.79 (s, 4H), 4.03 (t, J=6.3 Hz, 2H), 3.74 (s, 9H), 3.68 (t, J=6.2 Hz, 2H), 1.92 (q, J=6.3 Hz, 2H). 13C{1H} NMR (400 MHz, C3D6O) δ 156.29, 155.77, 143.59, 143.53, 142.22, 142.13, 126.17, 123.68, 123.64, 115.98, 115.37, 65.74, 58.80, 55.62, 33.11. HRMS-EI (m/z): [M]+ calcd for C36H36N2O5, 576.26; found, 576.4). Anal. Calcd for C36H36N2O5: C, 74.98; H, 6.39; N, 4.86. Found: C, 74.80; H, 6.25; N, 4.82.
