Sodium hydride → 4-[3-(4-Methyl-indol-1-yl)-propyl]-piperidine-1-carboxylic acid tert-butyl ester

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Reaction Steps

To a stirred solution of 4-methyl-1H-indole (1.0 g, 7.62 mmol) in DMF (20 mL), cooled at 0° C., was added NaH (60% in mineral oil; 0.40 mg, 9.91 mmol). After 45 min at 0° C., a solution of 4-(3-methanesulfonyloxy-propyl)-piperidine-1-carboxylic acid tert-butyl ester (2.44 g, 7.62 mmol) in DMF (10 mL) was added dropwise. The mixture was warmed to rt and stirred for 18 h. The mixture was diluted with CHCl3 (100 mL) and washed with water (100 mL). The organic layer was dried and concentrated to obtain the crude residue which was purified by FCC (EtOAc/hexanes) to give 1.50 g (55%) of a colorless oil. 1H NMR (CD3OD): 7.17 (d, J=8.2, 1H), 7.13-7.09 (m, 1H), 7.07 (d, J=3.2, 1H), 6.90 (d, J=6.9, 1H), 6.49 (d, J=3.2, 1H), 4.09 (t, J=7.1, 1H), 2.68-2.57 (m, 2H), 2.55 (s, 3H), 1.90-1.79 (m, 2H), 1.64-1.55 (m, 2H), 1.44 (s, 9H), 1.40-1.21 (m, 3H), 1.13-0.98 (m, 1H).

Provenance & Evidence