Dimethylformamide → HCID 86716090, compound

Participants

Reaction Conditions

Reaction Steps

A −71° C. solution of n-BuLi (6.14 mL, 1.59 M in hexane, 9.77 mmol) under argon was treated with a solution of 6-bromo-2,4-dichloro-8-methyl-3-phenylquinoline (3.26 g, 8.81 mmol, Intermediate 47, step a) in THF (27 mL) as an intermittent fine stream over 28 min. After a few minutes, DMF (1.38 mL, 17.8 mmol) was added dropwise over 2 min to the reddish-brown reaction, and the resulting greenish-black mixture was stirred at −72° C. for 30 min. The reaction was removed from the cold bath and allowed to stir under ambient conditions for 10 min, and was then quenched in one portion with 5 M NH4Cl (7 mL), partitioned with 4:1 EtOAc/heptane (50 mL) and 5:3 4 M NaCl/5 M NaBr (40 mL), and filtered. The filter cake was dissolved in 9:1 DCM/MeOH (15 mL), and this was combined with the clear yellow organic layer filtrate and dried (Na2SO4), filtered, and concentrated. The residue was dry load flash chromatographed with a 20% DCM/heptane to 100% DCM gradient to afford the title compound as a white solid.

Provenance & Evidence