Dimethylformamide → HCID 86663664, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-bromo-4′-chloro-3-iodobiphenyl (4.80 g, 0.012 mol) (described in WO 2008/071405) in anhydrous diethyl ether/tetrahydrofuran (120 ml, 1:1 ratio) at −75° C. is added isopropyl magnesium bromide (18.96 ml, 15% solution in tetrahydrofuran) dropwise such as to maintain an internal temperature below −70° C. Once addition is complete the reaction mixture is stirred at −75° C. for 2 hours, then warmed to −45° C. Anhydrous N,N-dimethylformamide (1.71 g, 0.0184 mol) is next added dropwise, maintaining temperature below −40° C., followed by warming to room temperature and quenching with 2M hydrochloric acid (60 ml). The reaction mixture is further diluted with diethyl ether, the two phases separated, and the aqueous phase extracted with additional diethyl ether. The combined organic extracts are washed with brine, dried over magnesium sulfate, filtered and the filtrate concentrated in vacuo. The crude product is purified by flash column chromatography (2% ethyl acetate in hexane eluant) to afford 4-bromo-4′-chloro-biphenyl-3-carbaldehyde (2.7 g, 75%) as a white solid.

Provenance & Evidence