反应详情

A −10° C. suspension of NaH (60% in mineral oil, 0.73 g, 18.2 mmol) in DMA (15 mL) was treated with 6-aminopyridin-3-ol (1.0 g, 9.1 mmol), stirred for 0.5 h, treated drop-wise with a solution of 4,6-dichloropyrimidine (2.03 g, 13.6 mmol) in DMA (10 mL), warmed to RT and stirred for 2 h. The mixture was treated with water, extracted with DCM (3×) and the combined organics were washed with 5% LiCl, then brine, dried over Na2SO4, concentrated to dryness and purified via silica gel chromatography (EtOAc) to afford 5-((6-chloropyrimidin-4-yl)oxy)pyridin-2-amine (1.0 g, 50%). 1H NMR (400 MHz, DMSO-d6): δ 8.62 (d, 1 H), 7.79 (d, 1 H), 7.33-7.26 (m, 2 H), 6.48 (d, 1 H), 6.00 (s, 2 H); MS (ESI) m/z: 223.0 (M+H+).

1. stirringstirred for 2 h
2. extractionextracted with DCM (3×)
3. washthe combined organics were washed with 5% LiCl
4. dry with materialbrine, dried over Na2SO4
5. concentrationconcentrated to dryness
6. custompurified via silica gel chromatography (EtOAc)