反应详情

Thionyl chloride (20 ml) was added dropwise to a stirred solution of diethyl 3-hydroxy-3(1-trityl-1,2,4-triazol-3-yl)propane phosphonate (1.0 g, prepared as described in Example 24) in pyridine (10 ml), whilst maintaining the temperature below 5° C. The mixture was allowed to warm to room temperature, stirred for three hours, then evaporated under reduced pressure. The residue was dissolved in ethyl acetate, washed with water and brine, dried over magnesium sulphate and evaporated under reduced pressure. This residue was chromatographed on silica, using dichloromethane-ethanol (49:1) as eluant, to give diethyl 3-chloro-3(1-trityl-1,2,4-triazol-3-yl)propane phosphonate (0.64 g, m.p. 123°-124° C.). NMR (CDCl3): δ1.3(6H,t), 1.8-2.1(2H,m), 2.4-2.6(2H,m), 4.1(4H,m), 5.1(1H,t), 7.1(6H,m), 7.4(9H,m), 7.95(1H,s). M/S: M+ 523,525.

1. temperaturewhilst maintaining the temperature below 5° C
2. customevaporated under reduced pressure
3. dissolutionThe residue was dissolved in ethyl acetate
4. washwashed with water and brine
5. dry with materialdried over magnesium sulphate
6. customevaporated under reduced pressure
7. customThis residue was chromatographed on silica