Reaktion #214202
ord-6c00c335a66b4af2a6d810b1a8eade9b
Reaktionsgleichung
Reagenzien
Lösungsmittel
Reaktionsbedingungen
Vorschrift
One molar equivalent of N-(4,5,6,7-tetrahydrobenzo[b]thien-4-yl)acetamide is oxidized in aqueous acetone at 10° C. to 15° C. with 2.66 moles of potassium permanganate in the pH range of 7 to 9 in the presence of magnesium sulfate buffer for a period of time from about 3 to 5 hours to afford N-(4,5,6,7-tetrahydro-7-oxobenzo[b]thien-4-yl)acetamide. The thus-obtained oxo-acetamide is hydrolyzed in aqueous hydrochloric acid to the corresponding amine. This amine is then reacted with sodium or potassium cyanate in an aqueous medium at about pH 6.5, and at a temperature of about 60° C. to 65° C., to afford the animal growth-promoting 4,5,6,7-tetrahydro-7-oxobenzo[b]thien-4-ylurea of formula (A). Oxidation of 4,5,6,7-tetrahydrobenzo[b]thien-4-ylurea under reaction conditions, similar to those described above, also affords the aforesaid urea of formula (A). The above reaction sequence may be graphically illustrated as follows: ##STR10##