Triphenylphosphine → Chroman-7-ol

Beteiligte Stoffe

Reaktionsschritte

To a stirred solution of 4-(3-Hydroxy-propyl)-benzene-1,3-diol (3.05 g, 18.1 mmol, from Step 1) in anhydrous THF (50 mL) were added Ph3P (7.13 g, 27.2 mmol, 1.5 eq) and ADDP (6.86 g, 27.2 mmol, 1.5 eq) under argon. The mixture was stirred at rt for 17 h. The white solid was filtered off and the solvent was removed from the filtrate. The residue was purified on silica gel (flash column chromatography) eluting with 5% ethyl acetate-hexane followed by 20% ethyl acetate-hexane to provide the desired product as white solid (1.80 g, 60.5%). 1H-NMR (CD3CN) δ 6.87 (d, 1H), 6.70 (broad, s, 1H, OH), 6.31 (dd, J=2.4, 8.2 Hz, 1H), 6.20 (d, 1H), 4.12 (t, 2H), 2.69 (t, 2H), 1.95 (m, 2H).

Herkunft & Nachweise