反应详情

To a stirred suspension of 6-((hydroxyimino)methyl)-N-(4-methoxybenzyl)-2-methylpyrimidine-4-carboxamide (0.15 g, 0.50 mmol, Preparation #B.1.1) and styrene (0.057 g, 0.50 mmol) in DCM (10 mL) was added 4% sodium hypochlorite solution (1.5 mL, Sd Fine Chem.) drop wise for about 10 min at RT and stirred for about another 2 h. The reaction mixture was diluted with water (50 mL) and the product extracted with DCM (3×25 mL). The organic layer was dried over sodium sulphate and evaporated to dryness under reduced pressure. The resulting mixture was purified by silica gel (60-120 mesh) chromatography eluting with 20 to 30% of EtOAc in hexane. Relevant fractions containing the target compound were combined and evaporated to dryness under reduced pressure to afford N-(4-methoxybenzyl)-2-methyl-6-(5-phenyl-4,5-dihydroisoxazol-3-yl)pyrimidine-4-carboxamide as a white solid 0.07 g (34%). LC/MS (Table 1, method-b) Rt=1.93 min; MS m/z: 403 (M+H).

1. extractionthe product extracted with DCM (3×25 mL)
2. dry with materialThe organic layer was dried over sodium sulphate
3. customevaporated to dryness under reduced pressure
4. customThe resulting mixture was purified by silica gel (60-120 mesh) chromatography
5. washeluting with 20 to 30% of EtOAc in hexane
6. additionRelevant fractions containing the target compound
7. customevaporated to dryness under reduced pressure