Oxalyl chloride → HCID 178436308, compound

Participants

Reaction Conditions

Reaction Steps

A 3.8 g portion of oxalic acid chloride was gradually added dropwise to 30 ml of methylene chloride solution containing 1.54 g of 3-vinylbenzoic acid and a catalytically effective amount of DMF and stirred at room temperature for about 2 hours, and then an appropriate amount of Tol was poured into the mixture and evaporation was carried out under a reduced pressure, thereby preparing 3-vinylbenzoic acid chloride. This was dissolved in a small amount of Diglyme and gradually added dropwise to 5 ml of Diglyme solution containing 0.82 g of 1-(3,5-difluorophenyl)-2-(1,3-dihydro-2H-benzimidazol-2-ylidene)ethanone which had been separately prepare in advance and 1.4 ml of TEA, under heating at 70° C. After completion of the dropwise addition, this was risen to 100° C. and heated for about 25 minutes, mixed with 0.1 ml of purified water, and further risen to 175° C. and heated for about 25 minutes. This was mixed with sodium bicarbonate aqueous solution, extracted several times with ethyl acetate, dried with anhydrous magnesium sulfate and concentrated, and then the thus formed residue was purified by a silica gel column chromatography to obtain 0.83 g (Reference Example 2-1) (68%) of 1-(3,5-difluorophenyl)-2-(1,3-dihydro-2H-benzimidazol-2-ylidene)-3-(3-vinylphenyl)propane-1,3-dione as a yellow foam compound from an ethyl acetate-hexane (1:3) eluate. FA: 403

Provenance & Evidence