tert-butyl 4-(5-amino-1H-indol-3-yl)piperidine-1-carboxylate → HCID 178451778, compound

Participants

Reaction Steps

A solution of compound 86 (0.45 g, 1.426 mmol) in dry ethanol (25 mL) was treated with thiophene-2-carboximidothioic acid methyl ester hydroiodide (0.81 g, 2.853 mmol) at room temperature and resulting solution was stirred for 24 h. The solvent was evaporated, crude was diluted with sat. NaHCO3 solution (25 mL) and CH2Cl2 (50 mL). The organic layer was separated and aqueous layer was extracted into CH2Cl2 (2×25 mL). The combined organic layer was washed with brine (20 mL) and dried (Na2SO4). The solvent was evaporated and the crude product was purified by column chromatography on silica gel (2 M NH3 in methanol: CH2Cl2, 3:97) to obtain compound 87 (0.6 g, quantitative) as a foam. 1H NMR (DMSO-d6) δ 1.40-1.56 (m, 11H), 1.90-1.94 (m, 2H), 2.86-2.94 (m, 3H), 4.02-4.06 (m, 2H), 6.26 (s, 1H), 6.64 (dd, 1H, J=1.2, 8.4 Hz), 6.99 (s, 1H), 7.05 (d, 1H, J=1.8 Hz), 7.09 (dd, 1H, J=3.6, 4.9 Hz), 7.27 (d, 1H, J=8.4 Hz), 7.59 (d, 1H, J=5.1 Hz), 7.71 (d, 1H, J=3.3 Hz), 10.63 (s, 1H); ESI-MS m/z (%): 425 (MH+, 100).

Provenance & Evidence