A facile synthesis of 2-substituted-4-(substituted)phenyl-Δ<sup>2</sup>-1,3,4-oxadiazolin-5-ones
作者:Kurt Pilgram、Richard D. Skiles
DOI:10.1002/jhet.5570140611
日期:1977.10
The title compounds, 3, are formed at ambient temperature from 4,4-dimethyl-2-(substituted)-phenylsemicarbazides (1) and carboxylic acid chlorides in the presence of triethylamine. 2-Dimethylamino-4-(substiluted)phenyl-Δ2-1,3,4-oxadiazolin-5-ones are formed from 1 and dialkyl-carbamoyl chlorides at elevated temperature (about 15° ). Acylation of 1 with carboxylic acid anhydrides, also at elevated temperature
在环境温度下,在三乙胺的存在下,由4,4-二甲基-2-(取代)-苯基氨基氨基脲(1)和羧酸氯化物形成标题化合物3。2-二甲氨基- 4-(substiluted)苯基-Δ 2 -1,3,4-恶二唑啉-5-酮是由1构成的和二烷基氨基甲酰氯在升高的温度(约15°)。同样在升高的温度下,用羧酸酐酰化1,伴随着二甲胺从中间体1-酰基-4,4-二甲基-2-(取代)苯基氨基氨基脲2中损失,得到3。