Tetrahydrofuran → {2-[1-Benzyl-3-(naphthalene-1-sulfonyl)-1h-indazol-5-yloxy]-ethyl}-ethyl-methyl-amine

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Reaction Steps

A solution of toluene-4-sulfonic acid 2-[1-benzyl-3-(naphthalene-1-sulfonyl)-1H-indazol-5-yloxy]-ethyl ester (0.363 g, 0.592 mmol) and ethylmethylamine (2.0 mL, 23 mmol) in THF (8 mL) was stirred at 70° C. for 2.5 hours in a sealed tube. After cooling to ambient temperature, the residue was partitioned in ethyl acetate and aqueous sodium bicarbonate. The organic phase was washed with brine, dried with anhydrous magnesium sulfate, filtered and concentrated. Drying at 80° C. in vacuo for 30 minutes gave {2-[1-benzyl-3-(naphthalene-1-sulfonyl)-1H-indazol-5-yloxy]-ethyl}-ethyl-methyl-amine as a yellow foam/gum (0.241 g, 81.4%). This was dissolved in chloroform, and ethereal hydrochloride was added. The mixture was concentrated and dried in vacuo for 13 hours to yield the hydrochloride as a buff foam (0.242 g). Mass Spectrum (+EI, [M+H]+) m/z 500. 1HNMR (500 MHz, DMSO-d6): δ10.04-10.10 (s, br, 1H), 8.74-8.77 (m, 1H), 8.54-8.56 (m, 1H), 8.27 (d, 1H, J=8.29 Hz), 8.02-8.05 (m, 1H), 7.79 (d, 1H, J=9.28 Hz), 7.70-7.74 (m, 1H), 7.55-7.67 (m, 2H), 7.28 (d, 1H, J=2.19 Hz), 7.04-7.20 (m, 6H), 5.70 (s, 2H), 4.35 (s, 2H), 3.33-3.41 (br, 2H), 3.01-3.19 (br, 2H), 2.73 (s, 3H), 1.17-1.21 ppm (m, 3H). Elemental Analysis for C29H29N3O3S.1.00 mol HCl.1.10 mol H2O: Calcd: C, 62.66; H, 5.84; N, 7.56; Found: C, 62.73; H, 6.19; N, 7.17.

Provenance & Evidence