Synthesis of Polyfluoroalkyl Cyclobutenes from 3-Aza-1,5-enynes via an Aza-Claisen Rearrangement/Cyclization Cascade
作者:Xiaoyi Xin、Dongping Wang、Fan Wu、Chunxiang Wang、Haolong Wang、Xincheng Li、Boshun Wan
DOI:10.1021/ol4020738
日期:2013.9.6
A facile synthetic route to access polyfluoroalkyl functionalized cyclobutenes bearing an exo cyclic double bond from 3-aza-1,5-enynes is reported. The reaction proceeds via a thermal aza-Claisen rearrangement to give an allene-imine intermediate; subsequent cyclization affords the cyclobutene core. The kinetics of the transformation of starting material and the intermediate was studied by 1H NMR spectroscopy
报道了一种容易的合成路线,该路线可从3-氮杂-1,5-烯炔中获得带有外环双键的多氟烷基官能化的环丁烯。反应通过热氮杂-克莱森重排进行,得到烯丙基-亚胺中间体;随后环化得到环丁烯核。通过1 H NMR光谱研究了起始原料和中间体的转化动力学,其中揭示了连续的反应。