A facile one-pot synthesis of 2-fluoroalkyl 1,3-imidazolines and 1,3-oxazolines through imidoyl halide intermediates
作者:Haizhen Jiang、Lan Sun、Shijie Yuan、Wenjun Lu、Wen Wan、Shizheng Zhu、Jian Hao
DOI:10.1016/j.tet.2012.01.086
日期:2012.4
A facile one-pot procedure has been developed for the synthesis of 1,3-imidazolines and 1,3-oxazolines bearing fluorinated alkyl groups at the 2-position. The reaction involves the condensation of N-monosubstituted ethane-1,2-diamines or 2-aminoethanols with a fluorinated carboxylic acid in the presence of PPh3/CX4. The proposed mechanism is that the amide intermediates were initially formed, and then
已经开发了一种简便的一锅法,用于合成在2位带有氟代烷基的1,3-咪唑啉和1,3-恶唑啉。该反应涉及在PPh 3 / CX 4的存在下,N-单取代的乙烷-1,2-二胺或2-氨基乙醇与氟化羧酸的缩合。所提出的机理是,首先形成了酰胺中间体,然后在PPh 3 / CX 4的存在下将其转化为亚氨酰卤中间体,随后将分子内快速环化为1,3-二唑啉产物。该方案可以合成2-溴二氟甲基-1,3-咪唑啉,一种有用的CF 2Br-杂环结构单元,可用于合成宝石-二氟亚甲基连接的化合物。