反应详情

A stirred solution of 18-Crown-6 (0.03 g) in dry tetrahydrofuran (25 ml) was treated successively with potassium ethylxanthate (0.44 g) and diethyl 3-bromo-3(1-trityl-1,2,4-triazol-3-yl)propane phosphonate (1.0 g, prepared as described in Example 29). The mixture was allowed to stand for two days, poured into water and extracted with ethyl acetate. The extracts were washed with brine, dried over magnesium sulphate, and evaporated under reduced pressure. The residue was chromatographed on silica, using dichloromethane-ethanol (49:1) as eluant, to give diethyl 3(ethoxythiocarbonylthio)-3(1-trityl-1,2,4-triazol-3-yl)propane phosphonate (0.86 g) as a colourless gum. NMR(CDCl3): δ1.25(6H,m), 1.4(3H,t), 1.7-1.9(2H,m), 2.3-2.4(2H,m), 4.0(4H,m), 4.6(2H,m), 5.05(1H,t), 7.1(6H,m), 7.3(9H,m), 7.9(1H,S). M/S: M+ 609.

1. extractionextracted with ethyl acetate
2. washThe extracts were washed with brine
3. dry with materialdried over magnesium sulphate
4. customevaporated under reduced pressure
5. customThe residue was chromatographed on silica