反应详情

5,6-bis(Benzyloxy)-N-[(4-fluorophenyl)methyl]pyridazin-3-amine (Intermediate 45; 0.7 g, 1.68 mmol) was dissolved in N,N-dimethylformamide (8 ml) and the solution was cooled to 0° C. before sodium hydride (60% by weight in paraffin; 0.101 g, 2.53 mmol, 1.5 equiv.) was added under nitrogen atmosphere. The reaction mixture was allowed to warm at room temperature for approximately 30 minutes and iodomethane (1.189 g, 8.43 mmol, 5 equiv.) was added. The reaction was allowed to stir at room temperature for one hour before being poured into water (100 ml) and the organic materials were extracted into ethyl acetate (50 ml×2). The organic layer was separated, washed with brine, dried (Na2SO4) and concentrated in vacuo. The crude compound was purified by column chromatography (silica gel, eluting with 0-50% ethyl acetate in hexane) to yield 5,6-bis(benzyloxy)-N-(4-fluorobenzyl)-N-methylpyridazin-3-amine (0.51 g, 64% yield).

1. additionwas added under nitrogen atmosphere
2. extractionthe organic materials were extracted into ethyl acetate (50 ml×2)
3. customThe organic layer was separated
4. washwashed with brine
5. dry with materialdried (Na2SO4)
6. concentrationconcentrated in vacuo
7. customThe crude compound was purified by column chromatography (silica gel, eluting with 0-50% ethyl acetate in hexane)