A new version of the reverse-Cope elimination initiated by the nucleophilic addition of allylamines to nitrones: a synthesis of vicinal diamines
作者:Michael B. Gravestock、David W. Knight、K. M. Abdul Malik、Steven R. Thornton
DOI:10.1039/b003959o
日期:——
are successful, giving the trans-oxadiazinanes 24, 33 and the stereoisomers 38 and 39 from linalylamine 37, but only when the terminus of the allylamine is unsubstituted are the reactions efficient. A range of N-alkylallylamines 43, 45, 47 and 49, however, react smoothly with nitrone 8, as competing imine formation is precluded. Various mechanistic aspects are discussed, along with the effects of aryl
尝试在与被保护的烯丙胺6进行对映选择性[1,3]偶极环加成反应中使用糖衍生的硝酮1只是部分成功,得到了预期加合物的混合物7。但是,硝酮1和未保护的烯丙胺11之间的反应遵循不同的途径,涉及通过胺,反向应对 环化和Meisenheimer重排导致1,2,5- oxadiazinanes 12和13。与类似的反应苯甲醛衍生的硝酮8是成功的,赋予反-oxadiazinanes 24,33和立体异构体38和39从芳基胺 如图37所示,但是只有当烯丙基胺的末端未被取代时,反应才有效。的范围Ñ -alkylallylamines 43,45,47和49,但是,与硝酮顺利反应8,如竞争性亚胺排除形成。讨论了各种机械方面,以及以下方面的影响:芳基在N-苄基烯丙胺57中和在硝酮8的4-位(59)处的取代基,没有发现可以提高总反应速率的取代基。最初的恶二嗪酮可用作氨基羟胺69和邻位的前体二胺衍生物70。