4-Chlorobenzoic Acid → HCID 15524329, compound

Participants

Reaction Steps

Intermnediate (1-a) (58.6 g), 4-chlorobenzoic acid (71.2 g) and polyphosphoric acid (580 g) were stirred at 140° C. for 48 hours. The mixture was poured into ice water and filtered off. The precipitate was washed with water, then with a diluted NH4OH solution and taken up in DCM. The organic layer was dried, filtered off and evaporated. The residue was purified by column chromatography over silica gel (eluent:CH2Cl2/CH3OH/NH4OH 99/1/0.1). The pure fractions were collected and evaporated, and recrystallized from CH2Cl2/CH3OH/DIPE, yielding 2.2 g of (±)-6-(4-chlorobenzoyl)-4-(3-chlorophenyl)-3,4-dihydro-2(1H)-quinolinone (interm. 1-b, mp. 194.8° C.).

Provenance & Evidence