Potassium cyanate → N-(4,5,6,7-Tetrahydro-1-benzothiophen-4-yl)urea
Reaktionsgleichung
Cl.[S:2]1[CH:6]=[CH:5][C:4]2[CH:7]([NH2:11])[CH2:8][CH2:9][CH2:10][C:3]1=2.[O-:12][C:13]#[N:14].[K+]>O>[S:2]1[CH:6]=[CH:5][C:4]2[CH:7]([NH:11][C:13]([NH2:14])=[O:12])[CH2:8][CH2:9][CH2:10][C:3]1=2Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
A mixture of 50 grams of 4,5,6,7-tetrahydrobenzo-[b]thiophen-4-amine hydrochloride (about 45 grams real, based on 90% purity) in 100 ml. of water is stirred at about 15° C., and a solution of 23.1 grams of potassium cyanate in 100 ml. of water is added dropwise. After completion of the addition, the mixture is warmed slowly to 70° C. to 75° C. and held for an hour. The mixture is cooled, and the white solid is collected by filtration and washed with water. The solid is air-dried, pulverized, and washed with acetonitrile. On drying, this gives 37.3 grams of crude product, which on treatment with about 1200 ml. of hot acetone gives 11.45 grams, melting point 200° C. to 204° C. of the title compound.