Sulfuric Acid → 1H,2H,3H,5H,6H-[1,3]diazolo[1,2-a]imidazole hydrochloride
Reaction equation
[Cl:1]C1C=CC([CH:6](O)[CH2:7][NH:8][C:9]2[NH:10][CH2:11][CH2:12][N:13]=2)=CC=1.S(=O)(=O)(O)O.[OH-].[Na+]>>[ClH:1].[NH:10]1[CH2:11][CH2:12][N:13]2[CH2:6][CH2:7][N:8]=[C:9]12Participants
Procedure
3.4 parts of p-chloro-α-(2-imidazoline-2-ylaminomethyl)benzyl alcohol are added to 30 parts of sulfuric acid 80% while stirring and cooling in an ice-bath. Upon completion, the whole is stirred for 2 hours at room temperature. The reaction mixture is poured onto crushed ice, alkalized with a concentrated sodium hydroxide solution and the product in base form is extracted with methylene chloride. The extract is dried, filtered and evaporated. The residue is dissolved in 2-propanol. The solution is filtered over diatomaceous silica and the filtrate is acidified with an excess of 2-propanol previously saturated with gaseous hydrogen chloride. The precipitated salt is filtered off, washed with acetone and dried, yielding 5-p-chlorophenyl)-2,3,5,6-tetrahydro-1H-imidazo[1,2-a]imidazole hydrochloride, m.p. 266.1°C.
Workup
- temperaturecooling in an ice-bath
- stirringUpon completion, the whole is stirred for 2 hours at room temperature
- additionThe reaction mixture is poured
- customonto crushed ice
- extractionthe product in base form is extracted with methylene chloride
- customThe extract is dried
- filtrationfiltered
- customevaporated
- dissolutionThe residue is dissolved in 2-propanol
- filtrationThe solution is filtered over diatomaceous silica
- filtrationThe precipitated salt is filtered off
- washwashed with acetone
- customdried
Sources & evidence
- ORD record
- ord-64f484679f1a44a498168abae716d20e
- Source dataset
- uspto-grants-1976_09
- Patent number
- US03983133
Reaction notes
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