2',4'-Dihydroxyacetophenone → HCID 69411916, compound

Participants

Reaction Steps

A solution of 20% lithiumhexamethyldisilazane in tetrahydrofuran (144 mL, 172 mmol), 2,4-dihydroxy acetophenone, 14 (6.5 g, 43 mmol) in tetrahydrofuran (150 mL) and ethyl-3,5-dimethoxy benzoate, 6 (9 g, 43 mmol) in tetrahydrofuran (100 mL) were reacted to afford 20, 1-(3,5-dimethoxy-phenyl)-3-(2,4-dihydroxy-phenyl)-propane-1,3-dione (15 g), which was cyclized with Dowex-H+ (5 g) in 2-propanol (200 mL) in a similar way as described for 22 to afford 26. Yield 7.6 g (59%); mp 267-268° C.; MS (FAB) 299 (M++1); IR (KBr) 3405, 1602; 1H NMR (200 MHz, DMSO-d6) δ 10.82 (s, 1H), 7.89 (d, J=8.7 Hz, 1H), 7.17 (d, J=2.0 Hz, 2H), 7.03 (d, J=1.9 Hz, 1H), 6.95 (s, 1H), 6.94 (dd, J=7.2 Hz, 2.0 Hz, 1H), 6.71 (s, 1H), 3.85 (s, 6H).

Provenance & Evidence