Hydrochloric Acid → 5,6,7,8-tetrahydro-4H-cyclohepta[b]thiophen-4-amine hydrochloride
Reaction equation
S1C=CC2C(=O)CCCCC1=2.[S:12]1[CH:16]=[CH:15][C:14]2[CH:17]([NH:22]C=O)[CH2:18][CH2:19][CH2:20][CH2:21][C:13]1=2.C(N)=O.[ClH:28]>>[ClH:28].[S:12]1[CH:16]=[CH:15][C:14]2[CH:17]([NH2:22])[CH2:18][CH2:19][CH2:20][CH2:21][C:13]1=2Participants
5
Procedure
5,6,7,8-Tetrahydro-4H-cyclohepta[b]thiophen-4-one is converted to N-(5,6,7,8-tetrahydro-4H-cyclohepta[b]thien-4-yl)formamide, m.p. 164°-166° C., by the method of Kloetzel et al., Journal of Organic Chemistry 18, 1511 (1953). Hydrolysis of the formamide is accomplished by refluxing for one hour in 1N hydrochloric acid and evaporating to dryness to afford 5,6,7,8-tetrahydro-4H-cyclohepta[ b]thiophen-4-amine hydrochloride, m.p. 233°-236° C. dec. The amine hydrochloride is then allowed to react with methyl isocyanate in dry tetrahydrofuran as solvent in the presence of a stoichiometric equivalent of triethylamine to afford 1-methyl-3-(5,6,7,8-tetrahydro-4H-cyclohepta[b]thien-4-yl)urea, m.p. 220°-222° C.
Workup
- customevaporating to dryness
Sources & evidence
- ORD record
- ord-0d41760056074492bfb9676c634acd53
- Source dataset
- uspto-grants-1977_07
- Patent number
- US04036979
Reaction notes
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