Ethyl Acetate → 8-Allyl-7-chloro-2-methoxy-[1,5]naphthyridine

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Reaction Conditions

Reaction Steps

Allyltributylstannane (7.3 g, 21.9 mmol, 1.2 eq) is added at room temperature to a stirred solution of 8-bromo-7-chloro-2-methoxy-[1,5]naphthyridine (5.0 g, 18.3 mmol, 1.0 eq) in N,N-dimethylformamide (100 mL), followed by tetrakis(triphenylphosphine)palladium(0) (0.63 g, 0.55 mmol, 0.03 eq) and lithium chloride (2.9 g, 67.6 mmol, 3.7 eq). After 1 hour stirring at 105° C., the reaction mixture is cooled down to room temperature and filtered through decalite. The filtrate is concentrated to give a crude product that is extracted with ethyl acetate (3×100 mL) and a 10% ammonium hydroxide aqueous solution (100 mL). The combined organic layers are washed with brine, dried over sodium sulfate, filtered and concentrated to give a crude product that is purified column chromatography (silica gel, eluent: petroleum ether:ethyl acetate, 30:1, v/v) to afford 8-allyl-7-chloro-2-methoxy-[1,5]naphthyridine as a colorless oil (2.5 g, 58% yield).

Provenance & Evidence