Ethyl 2-chloroacetoacetate → HCID 14500704, compound

Participants

Reaction Steps

A stirred slurry of 33.1 g (0.17 mole) of 4-phenylethyl-3-thiosemicarbazide in 500 mL of absolute ethanol under nitrogen atmosphere was treated with 29 g (0.17 mole) of ethyl 2-chloroacetoacetate, stirred at ambient temperature for ~72 hr, heated to reflux to dissolve most materials, and filtered hot. The filtrate was concentrated in vacuo to give a reddish oil, 71 g. The residue was chromatographed on 800 g Florosil® and eluted first with benzene to remove a yellow band (sulfur) followed by an acetone/benzene gradient which gave two main fractions. These two fractions were combined, and concentrated to give a yellow oil which solidified. Recrystallization (twice) from ligroin gave a fluffy white crystalline product, with small spots of green-yellow color, 12.1 g, mp 138°-139° C.

Provenance & Evidence