1,3-Dipolar cycloaddition reaction of 4,5-dihydro-1<i>H</i>-imidazole 3-oxides with alkynes
作者:Sergey A. Popov、Nikita V. Chukanov、Galina V. Romanenko、Tatjana V. Rybalova、Yuri V. Gatilov、Vladimir A. Reznikov
DOI:10.1002/jhet.5570430206
日期:2006.3
4,5-Dihydro-1H-imidazole 3-oxides bearing different substituents at positions 1 and 2 of the heterocycle were shown to react with a wide range of acceptor-substituted alkynes forming corrsponding cycloadducts - derivatives of 1,2,3,7a-tetrahydroimidazo[1,2-b]isoxazole. High regioselectivity of this process stipulated by conjugation of the nitrogen atom with the nitrone group was revealed.
显示在杂环的1和2位带有不同取代基的4,5-二氢-1 H-咪唑3-氧化物可与各种受体取代的炔烃反应形成相应的环加合物-1,2,3,7a衍生物-四氢咪唑并[1,2- b ]异恶唑。揭示了该过程的高区域选择性,这是由氮原子与硝酮基团的缀合所规定的。