Tandem Carbon−Carbon Bond-Forming Radical Addition-Cyclization Reaction of Oxime Ether and Hydrazone
作者:Hideto Miyabe、Masafumi Ueda、Kayoko Fujii、Azusa Nishimura、Takeaki Naito
DOI:10.1021/jo0341057
日期:2003.7.1
addition-cyclization of oxime ethers and hydrazones intramolecularly connected with the alpha,beta-unsaturated carbonyl group is described. The radical reaction of oxime ethers 1, 2, and 4 connected with acryloyl and methacryloyl moieties proceeded smoothly to give the heterocycles via a tandem C-C bond-forming process. The tandem reaction of hydrazone 5 took place in the presence of Zn(OTf)(2) as a Lewis acid to give
描述了与α,β-不饱和羰基分子内连接的肟醚和的新型串联自由基加成环化反应。与丙烯酰基和甲基丙烯酰基部分连接的肟醚1、2和4的自由基反应可通过串联CC键形成过程顺利进行,从而生成杂环。5 5的串联反应是在存在路易斯酸的Zn(OTf)(2)存在下进行的,得到的是环式产物17,而没有形成顺式异构体。还研究了手性肟醚19的非对映选择性自由基加成环化反应。即使在水性介质中,19的串联反应也能顺利进行,为γ-丁内酯和β-氨基酸衍生物的不对称合成提供了新方法。