Transannular Cyclizations of Medium-Sized Cycloalkynes and Cycloalkynones Induced by Electro- and Photochemically Generated NO3 Radicals
作者:Uta Wille、Christian Plath
DOI:10.1002/jlac.199719970117
日期:1997.1
Transannular radical cyclizations of medium-sized cycloalkynes and cycloalkynones induced by addition of NO3 radicals to the C–C triple bond were studied. In the reaction of NO3 with medium-sized cycloalkynes oxidation of the triple bond to a carbonyl group occurred and formation of cis-fused bicyclic alkanones by transannular cyclization was observed. In the reaction of NO3 radicals with medium-sized
研究了中型环炔烃和环炔酮的环戊基环化反应,该环化反应是通过将NO 3自由基加至C-C三键而引起的。在NO 3与中型环炔烃的反应中,发生了三键氧化成羰基的现象,并观察到通过环过环化形成顺式稠合双环烷酮。在NO 3自由基与中等大小的环炔酮的反应中,α,β-环氧酮以环空反应顺序形成,可以正式地认为是Eschenmoser-Ohloff逆向裂解反应。介绍了这些反应的范围和局限性,并提出了反应机理。