Adamantan Derivate, 4. Mitt.: Unerwartete Debenzylierung bei der Cyclisierung von 1-(1-Adamantylcarbonyl)-4-benzylthiosemicarbazid mit Schwefels�ure
作者:A. A. El-Emam、J. Lehmann
DOI:10.1007/bf00811852
日期:1994.5
Cyclization of 1-(1-adamantylcarbonyl)-4-substituted thiosemicarbazides 2a-e with sulphuric acid at ambient temperature or by heating with phosphorus oxychloride yielded the corresponding 2-(1-adamantyl)-5-amino-1,3,4-thiadiazoles 3a-e. Cyclization of 1-(1-adamantylcarbonyl)-4-benzylthiosemicarbazide 2f with sulphuric acid gave the debenzylated product 2-(1-adamantyl)-5-amino-1,3,4-thiadiazole 4. On the other hand, cyclization of 2f using phosphorus oxychloride yielded 2-(1-adamantyl)-5-benzylamino-1,3,4-thiadiazole 3f.