反应详情

Ethyl chlorooximidoacetate (3.30 mmol, 0.5 g) and propiolic acid (33.0 mmol, 2.311 g) were dissolved in diethyl ether (10 ml) with stirring. Triethylamine (3.30 mmol, 0.334 g) dissolved in diethyl ether (5 ml) was added dropwise to the previous mixture. The reaction mixture was stirred for three days at RT during which more triethylamine (2×0.668 g dissolved in 5 ml diethyl ether) was added dropwise. The pH of the reaction mixture was adjusted to 2. The organic phase was washed twice with water. The organic phase was dried, filtered and evaporated. The residue was dried under vacuum. 369 mg of the title compound was obtained. 1H-NMR (400 MHz, CDCl3): δ 1.44 (t, 3H), 4.49 (q, 2H), 7.41 (s, 1H), 10.59 (bs, 1H).

1. additionwas added dropwise to the previous mixture
2. additionwas added dropwise
3. washThe organic phase was washed twice with water
4. customThe organic phase was dried
5. filtrationfiltered
6. customevaporated
7. customThe residue was dried under vacuum