Hydrochloric Acid → HCID 14500695, compound

HRID 2350882Notes

Reaction equation

HRID 2350882 reaction equation
[Br:1][C:2]1[CH:7]=[C:6]([CH3:8])[C:5]([NH:9][C:10](=S)[NH:11][NH2:12])=[C:4]([CH3:14])[CH:3]=1.Cl[CH:16]([C:22]([CH3:24])=O)[C:17]([O:19][CH2:20][CH3:21])=[O:18].Cl>C(O)C>[Br:1][C:2]1[CH:7]=[C:6]([CH3:8])[C:5]([NH:9][C:10]2[C:16]([C:17]([O:19][CH2:20][CH3:21])=[O:18])=[C:22]([CH3:24])[NH:12][N:11]=2)=[C:4]([CH3:14])[CH:3]=1

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 11858Ethyl 2-chloroacetoacetateHCID 2735561N-(4-Bromo-2,6-dimethylphenyl)hydrazinecarbothioamide

Product 1

HCID 14500695HCID 14500695, compoundYield 20.8%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

A mixture of 14.6 g (0.06 mole) of 4-(4-bromo-2,6-dimethylphenyl)-3-thiosemicarbazide and 9.93 g (0.06 mole) of ethyl 2-chloroacetoacetate in 60 mL of absolute ethanol was stirred under nitrogen atmosphere for 2 hr, treated with 30 mL of 2N ethanolic hydrogen chloride and heated at reflux until the reaction mixture cleared (3 hr). The reaction mixture was filtered hot then concentrated in vacuo to give an orange solid which, when triturated with warm benzene/ligroin (50:50) and filtered gave 10.8 g of slightly orange crystalline product. The filtrate upon standing for ~16 hr gave an additional 4.4 g of yellow crystals which became white when washed with warm acetone. The 2 fractions were combined and recrystallized from benzene/ligroin to give 10.35 g of fine white crystalline rods, mp 171°-199° C. (with degassing). An NMR analysis showed the solid to be a salt with some solvent present; mass spectra confirmed the presence of hydrogen chloride. After drying at 82° C. under high vacuum, there was left 9.56 g, mp 168°-196° C. A broad melting point range suggested that it may be a mixture of free base and salt; therefore, it was dissolved in methanol/water along with other reaction mixture material, made basic with 3N sodium hydroxide and extracted with 5×60 mL of methylene chloride. The extracts were combined, washed with water, dried over magnesium sulfate and concentrated in vacuo to give a dark yellow solid. Recrystallization from benzene/ligroin then from benzene gave 10.7 g of white granular power, mp 184°-185° C.

Workup

  1. temperatureheated
  2. temperatureat reflux until the reaction mixture
  3. custom(3 hr)
  4. filtrationThe reaction mixture was filtered hot
  5. concentrationthen concentrated in vacuo
  6. customto give an orange solid which, when
  7. customtriturated with warm benzene/ligroin (50:50)
  8. filtrationfiltered
  9. customgave 10.8 g of slightly orange crystalline product
  10. waitThe filtrate upon standing for ~16 hr

Sources & evidence

ORD record
ord-af4315f786004d359692b1315789551f
Source dataset
uspto-grants-1989_10
Patent number
US04871737

Reaction notes

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