Glycol monoethyl ether → 4-(2,4-Dichloro-5-methoxyanilino)-7-methoxy-8-(chloroethoxy)benzo[g]quinoline-3-carbonitrile

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Reaction Conditions

Reaction Steps

A mixture of 1.10 g (3.17 mmol) of 4-chloro-7-methoxy-8-(2-chloroethoxy)benzo[g]quinoline-3-carbonitrile and 4-chloro-8-methoxy-7-(2-chloroethoxy)benzo[g]quinoline-3-carbonitrile (1:1 mixture), 50 mg of pyridine hydrochloride, 742 mg (3.86 mmol) of 2,4-dichloro-5-methoxyaniline and 25 mL of 2-ethoxyethanol is stirred and heated to 135° C. After 1 hour, the reaction is cooled to room temperature, quenched with 1.0 mL of triethylamine and concentrated in vacuo. The residue is dissolved in 95:5 methylene chloride/methanol and chromatographed on silica gel, eluting with 1:1 hexane/ethyl acetate. The product is precipitated from ethyl acetate to provide 0.760 g (48%) of 4-(2,4-dichloro-5-methoxyanilino)-7-methoxy-8-(chloroethoxy)benzo[g]quinoline-3-carbonitrile and 4-(2,4-dichloro-5-methoxyanilino)-8-methoxy-7(chloroethoxy)benzo[g]quinoline-3-carbonitrile (1:1 mixture) as a dull yellow solid, m.p. 239-55° C. dec.

Provenance & Evidence