Phenylglyoxal → N-(2-phenyl-2-hydroxyethyl)-4-(N-Boc-2-aminoethyl)aniline

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Reaction Steps

4-(N-Boc-2-aminoethyl)aniline 28 (1.25 g, 5.29 mmole) was dissolved in methanol (30 mL), followed by addition of phenyl glyoxal 24 (0.708 g, 5.28 mmole). The reaction mixture was stirred for 1 h at rt, prior to addition of NaCNBH3 (0.665 g, 10.6 mmole). The final mixture was stirred for 12 h at rt, concentrated, and purified by flash silica column chromatography (2 to 5% MeOH/CH2Cl2) to give N-(2-phenyl-2-hydroxyethyl)-4-(N-Boc-2-aminoethyl)aniline as a pale yellow oil (1.71 g, 91%): Rf=0.18 in 5% MeOH/CH2Cl2. 1H-NMR (CD3OD, 299.96 MHz): δ (ppm) 7.4–7.25 (m, 5H), 7.0–6.95 (d, 2H), 6.63–6.60 (d, 2H), 4.85–4.79 (dd, 1H), 3.3–3.21 (t, 2H), 3.2–3.15 (m, 2H), 2.64–2.5 (t, 2H), 1.42 (s, 9H).

Provenance & Evidence