Potassium Acetate → (2-Chloro-6-o-tolylquinolin-3-yl)methanol

Participants

Reaction Steps

A mixture of (6-bromo-2-chloroquinolin-3-yl)methanol (19.8 g, 72.5 mmol, prepared as in example 2, step 2), o-tolylboronic acid (10.4 g, 76.1 mmol), potassium acetate (21.3 g, 217.4 mmol) and dichlorobis(4-(di-tert-butylphosphino)-N,N-dimethylaniline)palladium (II) (0.51 g, 0.72 mmol) in CH3CN (300 ml) and water (100 ml) was heated in to reflux. After 2 h, the reaction was allowed to cool to RT and the aqueous phase was discarded. The organics were washed with 2×50% brine/water, and then 2× brine. The organics were concentrated to ˜100 mL, at which point the precipitate was filtered off to afford a pale yellow solid of (2-chloro-6-o-tolylquinolin-3-yl)methanol. Step 2: (2-chloro-6-o-tolylquinolin-3-yl)methanol (13.9 g, 49.0 mmol) was treated with DCM (100 ml) and thionyl chloride (106 ml, 1456 mmol) at ambient temperature. After 15 min, the solution was concentrated and azeotroped with 2×100 mL toluene, to afford a yellow solid of 2-chloro-3-(chloromethyl)-6-o-tolylquinoline.

Provenance & Evidence