Studies on Sulfenamides. XIV. A New Method of Generating of 2,4-Dinitrobenzenesulfenylnitrene.
作者:Takashi MICHIDA、Hiroteru SAYO
DOI:10.1248/cpb.42.27
日期:——
2, 4-Dinitrobenzenesulfenylnitrene (A) was produced by the oxidation of 2, 4-dinitrobenzenesulfenamide (1) with N-bromosuccinimide, and trapped as N-sulfenylaziridines (3-7). In the presence of a large excess of olefins, the aziridines were produced in 6-57% yields. On the other, when a large excess of 1 was used, the aziridines were synthesized in 62-72% yields based on the olefins. cis-Stilbene gave a mixture of cis-1-(2, 4-dinitrobenzenesulfenyl)-2, 3-diphenylaziridine (8) and the trans isomer (4). On the other hand, trans-stilbene gave only 4. These results suggest the involvement of a biradical intermediate in these reactions.
2,4-二硝基苯磺酰亚胺氮宾(A)是通过N-溴代琥珀酰亚胺氧化2,4-二硝基苯磺酰胺(1)产生的,并被捕获为N-磺酰亚胺氮丙啶(3-7)。在大量烯烃存在的情况下,氮丙啶以6-57%的产率生成。另一方面,当大量使用1时,基于烯烃的氮丙啶合成产率在62-72%之间。顺式-芪产生了顺式-1-(2,4-二硝基苯磺酰基)-2,3-二苯基氮丙啶(8)及其反式异构体(4)的混合物。另一方面,反式-芪只产生了4。这些结果表明在这些反应中涉及了一个双自由基中间体。