Hydrochloric Acid → HCID 70377880, compound

Participants

Reaction Steps

A stirred solution of 7.05 g (0.04 mole) of 4-(3-dimethylaminopropyl)-3-thiosemicarbazide in 50 mL of absolute ethanol under nitrogen atmosphere was treated with 40 mL of 2N ethanolic hydrogen chloride and then with 6.6 g (0.04 mole) of ethyl 2-chloroacetoacetate, stirred at ambient temperature for 2 hr and heated at reflux for 5 hr. The reaction mixture was filtered hot to remove some crystalline sulfur and the filtrate solidified on cooling to give 8.3 g of crude product. After 5 recrystallizations from methyl ethyl ketone/methanol with charcoal treatment of the final recrystallization, a crystalline product was obtained, 3.4 g, mp 195°-196° C. After drying at 82° C. under reduced pressure, it was submitted for elemental analysis.

Provenance & Evidence