作者:Sureshbabu Dadiboyena、Jianping Xu、Ashton T. Hamme
DOI:10.1016/j.tetlet.2006.12.005
日期:2007.2
The regioselective synthesis of 3,5-disubstituted isoxazoles was achieved through the 1,3-dipolar cycloaddition of nitrile oxides with 1,1-disubstituted bromoalkenes. The substituted bromoalkenes function as alkyne synthons which were used to construct 5,5-disubstituted bromoisoxazoline intermediates that aromatize to the analogous isoxazoles through the loss of HBr.
3,5-二取代异恶唑的区域选择性合成是通过腈氧化物与 1,1-二取代溴烯烃的 1,3-偶极环加成实现的。取代的溴烯烃用作炔合成子,用于构建 5,5-二取代的溴异恶唑啉中间体,通过失去 HBr 芳构化为类似的异恶唑。