Triphenylphosphine → 7-{2-[1-(1-Ethoxycarbonylmethyl-butyl)-1H-indol-5-yloxy]-ethyl}-3,4-dihydro-2H-[1,8]naphthyridine-1-carboxylic acid tert-butyl ester

Participants

Reaction Steps

Triphenylphosphine (0.20 g, 0.77 mmol) was added to a solution of 7-(2-hydroxy-ethyl)-3,4-dihydro-2H-[1,8]naphthyridine-1-carboxylic acid tert-butyl ester (0.16 g, 0.58 mmol) and 3-(5-hydroxy-indol-1-yl)-hexanoic acid ethyl ester (0.10 g, 0.38 mmol) in THF (4 mL) at 0° C. Diisopropylazodicarboxylate (0.15 g, 0.77 mmol) was added dropwise and the reaction was stirred at room temperature overnight. The solution was then concentrated. The residue was purified by flash chromatography on silica gel (30% ethyl acetate in hexane) to give the title compound (13% yield). 1H NMR (CDCl3) δ 7.30 (m, 2H), 7.09 (m, 2H), 6.96 (d, 1H, J=7.6 Hz), 6.86 (m, 1H), 6.41 (d, 1H, J=3.2 Hz), 4.78 (m, 1H), 4.39 (t, 2H, J=6.9 Hz), 3.98 (q, 2H, J=7.1 Hz), 3.75 (m, 2H), 3.21 (t, 2H, J=6.9 Hz), 2.86 (m, 2H), 2.77 (m, 2H), 1.85 (m, 4H), 1.50 (s, 9H), 1.20 (m, 2H), 1.06 (t, 3H, J=7.1 Hz), 0.85 (t, 3H, J=7.4 Hz).

Provenance & Evidence