Oxalyl chloride → 7-(4-(4-(2,3-Dichlorophenyl)piperazin-1-yl)butoxy)quinolin-2-yl dibenzyl phosphate

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Reaction Steps

To a solution of dibenzyl phosphate (2.48 g, 8.91 mmol) in dichloromethane (25 ml) was added dimethyl formamide (1 drop) followed by oxalyl chloride (0.75 mL, 8.91 mmol). After 2 hours the reaction mixture was concentrated in vacuo. The residue was dissolved in 2-methyltetrahydrofuran (5 mL) and added to a suspension of dehydro-aripiprazole (1.66 g, 3.71 mmol) and potassium t-butoxide (0.92 g, 8.17 mmol) in 2-methyltetrahydrofuran (35 mL) at 0° C. under Ar (g) then allowed to gradually warm to room temperature. After stirring overnight the reaction was quenched with water (25 mL) and 28% aq NH3 (15 mL) and stirred for 10 minutes. The reaction mixture was then extracted with ethyl acetate (2×40 mL). The combined organics were washed with water (50 mL) and brine (50 mL) then dried (MgSO4) and concentrated in vacuo. The crude mixture was purified by column chromatography eluting with 5% methanol (1:1 ethyl acetate/dichloromethane) to give the product. The 1H-NMR showed minor impurities still present (impurities not observed by LCMS). Various further purifications were attempted but failed to remove these impurities.

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