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A solution of 61 g of ethyl-2,4-dichloroacetoacetate (0.306 mol) and 30 g of 2-ethylacrolein (0.357 mol) in 500 mL of absolute ethanol is mixed with 85.5 g of ammonium sulfamate (0.75 mol), and the stirred mixture is heated at reflux for 90 minutes. The reaction is concentrated in vacuo and the residue is partitioned between ethyl acetate and water. The organic phase is concentrated in vacuo, and the residue is chromatographed on silica gel using hexane-ethyl acetate mixtures to give 50 g of crude product. This material is purified by extraction into aqueous hydrochloric acid, washing with hexanes, making the aqueous phase basic with cold ammonium hydroxide, and extracting with hexanes to afford 30 g of the title product as an oil (43%), having elemental analysis calculated for C11H14ClNO2 % C 58.03, H 6.20, N 6.15, Cl 15.57 found % C 58.29, H 6.30, N 6.02, Cl 15.49.

1. temperaturethe stirred mixture is heated
2. temperatureat reflux for 90 minutes
3. concentrationThe reaction is concentrated in vacuo
4. customthe residue is partitioned between ethyl acetate and water
5. concentrationThe organic phase is concentrated in vacuo
6. customthe residue is chromatographed on silica gel
7. customto give 50 g of crude product
8. customThis material is purified by extraction into aqueous hydrochloric acid
9. washwashing with hexanes
10. extractionextracting with hexanes