反应详情

2-(3-Bromo-quinolin-6-yloxy)-N-(1,1-dimethyl-2-oxo-ethyl)-2-methylsulfanyl-acetamide (0.1 g) from Stage 2, Step 2 above, pyridine (0.022 ml) and O-n-butyl-hydroxylamine hydrochloride (0.035 g) in methanol (5 ml) were stirred at rt for 3 hours. The reaction mixture was diluted with ethyl acetate and poured onto sat. NaHCO3 (30 ml). The two phases were separated and the aqueous layer was extracted with ethyl acetate (3×50 ml). The organic layers were combined, dried over magnesium sulphate, filtered and evaporated. The residue was purified by column chromatography (heptane/ethyl acetate 3:1) to give 2-(3-bromo-quinolin-6-yloxy)-N-(2-butoxyimino-1,1-dimethyl-ethyl)-2-methylsulfanyl-acetamide as white solid (0.115 g). 1H NMR (CDCl3) δ ppm: 8.81 (1H, d); 8.24 (1H, d); 8.04 (1H, d); 7.71 (1H, s); 7.45 (1H, dd); 7.39 (1H, s); 7.17 (1H, d); 5.64 (1H, s); 4.08 (2H, t); 2.19 (3H, s); 1.68-1.58 (8H, m); 1.45-1.36 (2H, m), 0.94 (3H, t).

1. customThe two phases were separated
2. extractionthe aqueous layer was extracted with ethyl acetate (3×50 ml)
3. dry with materialdried over magnesium sulphate
4. filtrationfiltered
5. customevaporated
6. customThe residue was purified by column chromatography (heptane/ethyl acetate 3:1)