作者:Ashton Hamme II、Jianping Xu
DOI:10.1055/s-2008-1042906
日期:2008.4
The direct regioselective synthesis of 3,5-disubstituted isoxazoles was achieved in one reaction vessel through a sequence of reactions involving the net bromination of an electron-deficient alkene, in situ generation of a nitrile oxide, 1,3-dipolar cycloaddition, and loss of HBr from an intermediate 5,5-disubstituted bromoisoxazoline. This one-pot process enables the synthesis of 3,5-disubstituted
3,5-二取代异恶唑的直接区域选择性合成是在一个反应容器中通过一系列反应实现的,包括缺电子烯烃的净溴化、腈氧化物的原位生成、1,3-偶极环加成和损失HBr 来自中间体 5,5-二取代溴异恶唑啉。这种一锅法可以直接从缺电子烯烃合成 3,5-二取代异恶唑,从而消除 1,1-二取代溴烯烃炔替代物的分离。