Dimethylamine → (5-ethoxy-1H-indol-ylmethyl)-dimethyl-amine

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A mixture of 5-ethoxy-indole (7.84 g, 48.7 mmol), 40% aqueous dimethylamine (9.25 ml, 73 mmol, 1.5 equiv), and 96% acetic acid (30 ml) is stirred at 0° C., then 36% aqueous formaldehyde solution (6.33 ml, 82.7 mmol, 1.7 equiv) is added drop wise. The mixture is allowed to come to room temperature, and after stirring overnight TLC (dichloromethane-methanol, 4:1) indicates the absence of starting material. 10% Aqueous NaOH (150 ml) is added and the mixture is stirred at room temperature for 2 h. It is then extracted with dichloromethane (4×200 ml), the organic layer is dried and concentrated. The residue is purified by column chromatography (dichloromethane-methanol, 4:1→methanol-aqueous ammonia 50:1) to give crude product (10.18 g, 96%), which is crystallized from acetone to provide pure (5-ethoxy-1H-indol-ylmethyl)-dimethyl-amine (10.2 g, 96%) as white crystals. M.p. 95-97° C.

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