Diisobutylaluminum hydride → 4-hydroxymethyl-N-(2-hydroxyphenyl)-benzamide

Beteiligte Stoffe

Reaktionsschritte

To a solution of (2-hydroxyphenyl)-terephthalamic acid methyl ester (1.31 g, 4.8 mmol) in THF (50 mL) at −78° C. was added a solution of DIBAL-H (27 mL, 1.0 M in THF). The reaction was allowed to warm to room temperature, stirred for 1 h and quenched with a saturated potassium sodium tartrate solution (15 mL). The biphasic mixture was stirred vigorously for 1 h, the phases separated and the organic layer dried (MgSO4), filtered, concentrated and purified by column chromatography on silica gel (5% MeOH/CH2Cl2) to give 4-hydroxymethyl-N-(2-hydroxyphenyl)-benzamide (0.58 g, 50%). 1H NMR (CDCl3) δ 1.83 (t, 1H (OH)), 4.82 (d, 2H, J=6.0 Hz), 6.93 (t, 1H, J=7.8 Hz), 7.08 (t, 1H, J=7.8 Hz), 7.19 (d, 2H, J=7.8 Hz), 7.53 (d, 2H, J=6.0 Hz), 7.92 (d, 2H, J=7.8 Hz), 8.07 (br, 1H), 8.62 (s, 1H).

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