Sodium Bicarbonate → N-[9-chloro-7-(2,6-difluoro-phenyl)-5H-benzo[c]pyrimido[4,5-e]azepin-2-yl]-benzene-1,4-diamine

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Reaction Steps

A mixture of [9-chloro-7-(2,6-difluoro-phenyl)-5H-benzo[c]pyrimido[4,5-e]azepin-2-yl]-(4-nitro-phenyl)-amine (I-212, 500 mg, 1.05 mmol), stannous chloride dihydrate (1.42 g, 6.3 mmol) and ethyl acetate (15 mL) was refluxed for 28 hours, then cooled to room temperature and allowed to sit overnight. The mustard-yellow reaction mixture was poured onto ˜50 g cracked ice with stirring, and sat. NaHCO3 solution was added to adjust the pH to 8. The mixture was extracted with ethyl acetate (3×100 mL). The extracts were combined, dried (Na2SO4), filtered and evaporated in vacuo to provide N-[9-chloro-7-(2,6-difluoro-phenyl)-5H-benzo[c]pyrimido[4,5-e]azepin-2-yl]-benzene-1,4-diamine as an orange/yellow solid (500 mg, 100%) MS m/z=448 (M+H). A solution of this product (50 mg, 0.1 mmol), 4-methylpiperazine-1-carbonylchloride (89 mg, 0.6 mmol), diisopropylethylamine (142 mg, 1.1 mmol), in dioxane (0.5 mL) was submitted to microwave irradiation (300 W) for 60 minutes at 160° C. The reaction solution was cooled to room temperature and slowly poured into a stirring saline solution (10 mL). The resulting precipitate was collected by filtration, washed with water and purified by RP-HPLC(C18, 0 to 100% CH3CN in 0.1% aqueous HCO2H) to yield I-280 as a pale yellow solid (6 mg, 10%) MS m/z=574 (M+H).

Provenance & Evidence