Diisopropylethylamine → 2-{4-[Bis-(1-pyridin-2-yl-ethyl)-amino]-butyl}-isoindole-1,3-dione

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Using General Procedure A: To a stirred solution of methanesulphonic acid 1-pyridin-2-yl-ethyl ester (269 mg, 1.34 mmol) and 2-[4-(1-pyridin-2-yl-ethylamino)-butyl]-isoindole-1,3-dione (356 mg, 1.10 mmol) in CH3CN (5 mL) at room temperature was added DIPEA (0.30 mL, 1.72 mmol) and KI (13 mg, 0.078 mmol). After 3 hours the temperature was increased to 60° C. and the mixture stirred for another 17 hours. KI (23 mg, 0.139 mmol) and DMAP (35 mg, 0.286 mmol) were added and the reaction stirred for a further 2 hours. Work up and purification by flash chromatography (35:1:1 CH2Cl2: MeOH: NH4OH) afforded pure 2-{4-[bis-(1-pyridin-2-yl-ethyl)-amino]-butyl}-isoindole-1,3-dione as a mixture of diastereomers (139 mg, 30%). 1H NMR (CDCl3) δ 1.18-1.49 (m, 10H) containing 1.27 (d, 3H, J=7.0 Hz) and 1.42 (d, 3H, J=7.1 Hz), 2.51-2.80 (m, 2H), 3.44-3.52 (m, 2H), 4.03-4.12 (m, 2H), 6.98-7.07 (m, 2H), 7.31 (d, 1H, J=7.9 Hz), 7.45-7.61 (m, 3H) containing 7.47 (d, 1H, J=7.9 Hz), 7.66-7.70 (m, 2H), 7.76-7.81 (m, 2H), 8.43-8.48 (m, 2H). ES-MS m/z 429 [M+H].

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