2-Acetylhydroquinone → HCID 69403676, compound

Participants

Reaction Steps

A solution of 20% lithiumhexamethyldisilazane in tetrahydrofuran (200.8 mL, 240 mmol), 2,5-dihydroxy acetophenone, 15 (9.12 g, 60 mmol) in tetrahydrofuran (150 mL) and ethyl-3,4-dibenzyloxy benzoate, 9 (21.7 g, 60 mmol) in tetrahydrofuran (100 mL) were reacted to afford 18, 1-(3,4-bis-benzyloxy-phenyl)-3-(2,5-dihydroxy-phenyl)-propane-1,3-dione (41 g), which was cyclized with Dowex-H+(12 g) in 2-propanol (300 mL) in a similar way as described for 22 to afford 24. Yield 12 g (44%); mp 196-197° C.; MS (FAB) 451 (M++1); IR (KBr) 3419, 1621; 1H NMR (200 MHz, DMSO-d6) δ 10.08 (s, 1H), 7.75 (s, 1H), 7.69 (d, J=8.7 Hz, 1H), 7.63 (s, 1H), 7.55-7.22 (m, 13H), 6.94 (s, 1H), 5.30 (s, 2H), 5.27 (s, 2H).

Provenance & Evidence