Acetic Acid → HCID 15345817, compound

Participants

Reaction Steps

To a suspension of 5.0 g (24 mmol) of 2-amino-3-chloro-1,4-dihydro-1,4-dioxonaphthalene in 80 mL of water, 8.4 g (35 mmol) of nonahydrated sodium sulfide are added. The reaction mixture is then heated to reflux for approximately 20 min, then 20 mL of an aqueous solution containing 2.0 g of sodium sulfide are added. When the color of the medium has completely changed to blue, 1.95 mL (24 mmol) of 2-fluorobenzaldehyde and 6.36 mL of glacial acetic acid are added successively. After 1 h of reflux, the black semisolid product obtained is filtered, dried, and purified on a flash column (support: silica; conditioning: heptane; eluant: dichloromethane/heptane, 50/50). The greenish crystals formed after evaporation of the solvent are washed several times with ethanol and ether, then they are uncolored and recrystallized in dichloromethane to produce 2.0 g of 4,9-dihydro-4,9-dioxo-2-(2-fluorophenyl)-naphtho[2,3-d]thiazole in the form of yellow crystals.

Provenance & Evidence