HCID 57474453, compound → HCID 178462534, compound

Participants

Reaction Steps

A solution of 3-(1-ethyl-1,2,3,6-tetrahydropyridin-4-yl)-5-nitro-1H-indole (60) (0.1 g, 0.368 mmol) in dry ethanol (5 mL) was treated with 10% Pd—C (0.02 g), purged with hydrogen gas and stirred for 4 h under hydrogen atm. (balloon pressure). The solid was filtered off using celite bed and washed with dry ethanol (2×5 mL). The combined ethanol layer was treated with thiophene-2-carboximidothioic acid methyl ester hydroiodide (0.21 g, 0.737 mmol) and stirred for 24 h at room temperature. The solvent was evaporated and product was precipitated with ether (100 mL). The solid was filtered and dissolved into sat. NaHCO3 sol.: CH2Cl2 (50 mL, 1:1). The org. layer was separated and aqueous layer was extracted with CH2Cl2 (2×20 mL). The combined CH2Cl2 layer was washed with brine (15 mL) and dried (Na2SO4). The solvent was evaporated and crude was purified by column chromatography (2M NH3 in methanol: CH2Cl2, 5:95) to obtain N-(3-(1-ethylpiperidin-4-yl)-1H-indol-5-yl)thiophene-2-carboximidamide (61) (0.085 g, 66%) as a solid. mp 150-152° C.; 1H NMR (DMSO-d6) δ 1.01 (t, 3H, J=6.9 Hz), 1.59-1.75 (m, 2H), 1.90-2.05 (m, 4H), 2.35 (q, 2H), 2.65-2.73 (m, 1H), 2.94-2.97 (m, 2H), 6.23 (brs, 1H), 6.62 (dd, 1H, J=1.2, 8.4 Hz), 6.97 (s, 1H), 7.02 (d, 1H, J=2.1 Hz), 7.09 (t, 1H, J=4.2 Hz), 7.26 (d, 1H, J=8.4 Hz), 7.58 (d, 1H, J=5.4 Hz), 7.70 (d, 1H, J=3.6 Hz), 10.59 (s, 1H); ESI-MS m/z (%): 353 (M+, 100).

Provenance & Evidence