反应详情

A suspension of 6-amino-3-(2-methyl-3-nitrophenyl)-1,2,4-triazin-5(2H)-one (0.95 g, 3.38 mmol) in thionyl chloride (180 mL, 2466 mmol) was heated at reflux for 4 hr, after which period the mixture became a clear solution. The volatiles were removed under vacuum. The residue was dissolved in ice-cold ethyl acetate (250 mL), washed with water (2×60 mL), saturated NaHCO3 solution (60 mL), and brine (60 mL). The organic solution was dried over anhydrous MgSO4 and concentrated under vacuum to dryness to provide the desired product, 5-chloro-3-(2-methyl-3-nitrophenyl)-1,2,4-triazin-6-amine (0.97 g, 3.47 mmol, 77% yield over two steps), as a yellow solid.

1. temperaturewas heated
2. temperatureat reflux for 4 hr
3. customThe volatiles were removed under vacuum
4. dissolutionThe residue was dissolved in ice-cold ethyl acetate (250 mL)
5. washwashed with water (2×60 mL), saturated NaHCO3 solution (60 mL), and brine (60 mL)
6. dry with materialThe organic solution was dried over anhydrous MgSO4
7. concentrationconcentrated under vacuum to dryness