(R)-1-Pyridin-2-yl-ethylamine → 7-(3,5-dimethyl-4-isoxazolyl)-6-(methyloxy)-N4-[(1R)-1-(2-pyridinyl)ethyl]-3,4-quinolinediamine

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A solution of 4-chloro-7-(3,5-dimethyl-4-isoxazolyl)-6-(methoxy)-3-nitroquinoline (for a preparation see Intermediate 18, 400 mg,) and (R)-1-(pyridin-2-yl)ethanamine (293 mg) in acetonitrile (30 ml) was heated at 60° C. for 2 h. The reaction mixture was extracted with DCM and washed with a saturated solution of sodium hydrogen carbonate. The organic was dried over Na2SO4, filtered and concentrated to dryness. The resulting compound was taken-up in ether, filtered and dried in vacuo. The residue was dissolved in ethanol (20 ml) and HCl (3.8 ml). Tin (II) chloride dihydrate (0.89 g) was then added in four portions and the reaction mixture was stirred for 1 h at 40° C. The reaction mixture was hydrolysed using a solution of sodium hydroxide (1N). The mixture was extracted with DCM, the organic dried over Na2SO4, filtered over Celite and concentrated to dryness. The crude product was purified via flash column chromatography on silica gel eluting with DCM/MeOH (95/5) and the obtained product was taken-up in diisopropylether to give 7-(3,5-dimethyl-4-isoxazolyl)-6-(methyloxy)-N4-[(1R)-1-(2-pyridinyl)ethyl]-3,4-quinolinediamine (250 mg) as a brown powder. LC/MS: Rt 2.62 min.

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