Reaktionsschritte
To a solution of 36.3 mg (55.26 μmol) 3-(2′,2″-Diisobutyl-4-methoxycarbonylmethoxy-3-naphthalen-1-ylmethyl-[1,1′:4′,1″]-terphenyl-4″-yl)propionic acid methyl ester (79) in 8 ml 1.4-dioxane 2.0 ml (16.60 mmol, 301 eq.) 25% aq. NaOH-solution and 2.0 ml (3.08 mmol, 56 eq.) 40% aq. solution of Bu4NOH were added. The resulting mixture was refluxed for 24 h and then cooled to 0° C. Acidification to pH 1 by adding 1 N aq. HCl-solution led to a white precipitate which was obtained by filtration. A filtration over silica gel with EtOAc/HOAc (95+5)) as an eluent and a following lyophilization of the obtained oily product from a solution in CH3CN and aq. NH3-solution yielded 36.6 mg (55.2 μmol, 100%) of the bisammonia-salt of 3-(4-(Carboxymethoxy)-2,2″-diisobutyl-3-naphthalen-1-ylmethyl-[1,1′:4′,1″]-terphenyl-4″-yl)propionic acid (80) as a white solid. Rf (hexanes/EtOAc (1+1), sample dissolved in HOAc)=0.49. 1H-NMR (500 MHz, d4-MeOH): δ=0.43 (d, 6H, J=6.62 Hz, 2*CH3), 0.65 (d, 6H, J=6.62 Hz, 2*CH3), 1.35 (m, 1H, CH), 1.58 (m, 1H, CH), 2.14 (d, 2H, J=7.41 Hz, CH2), 2.44 (d, 2H, J=7.25 Hz, CH2), 2.56 (t, 2H, J=7.41 Hz, CH2CH2CO2NH4), 2.90 (t, 2H, J=7.57 Hz, CH2CH2NH4), 4.58 (s, 2H, CH2Naphthyl), 4.59 (s, 2H, OCH2CO2NH4), 6.62 (d, 1H, J=2.05 Hz), 6.89-7.08 (m, 8H), 7.38-7.45 (m, 4H), 7.73 (m, 1H), 7.83 (m, 1H), 8.08 (m, 1H). 13C-NMR (125 MHz, d4-MeOH): δ=22.97, 23.13, 30.75, 31.02, 32.69, 33.91, 38.49, 43.45, 43.73, 68.54, 112.71, 126.33, 126.85, 126.92, 126.99, 127.26, 128.00, 128.35, 129.01, 129.22, 129.90, 130.84, 131.09, 131.41, 131.49, 132.31, 132.42, 134.19, 135.91, 135.95, 138.60, 140.16, 140.53, 141.56, 141.86, 142.22, 142.28, 157.00, 177.34, 178.03. MS (FAB−): m/z=629 (18), 628 (29), 627 (54), 570 (42), 569 (100), 568 (16), 567 (24), 527 (24), 526 (30), 525 (70), 524 (30), 523 (58), 481 (30), 347 (14), 153 (96). HR-MS (FAB−): not possible.
