Stannous chloride dihydrate → N4-(3-ethynylphenyl)-7-fluoroquinazoline-4,6-diamine

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Reaction Steps

A mixture of N-(3-ethynylphenyl)-7-fluoro-6-nitroquinazolin-4-amine (310 mg, 1 mmol) and SnCl2.2H2O (171 mg, 4.5 mmol) in ethyl acetate (35 mL) was refluxed for 2 h. After cooled to room temperature, the mixture was treated with 5% aqueous NaHCO3 to adjust its pH value to 9-10. It was then subjected to extraction with EtOAc. The combined organic layers were washed with saturated brine and H2O and dried. The solvent was removed under reduced pressure to give 225 mg (81%) N4-(3-ethynylphenyl)-7-fluoroquinazoline-4,6-diamine as a yellow solid.

Provenance & Evidence