Photochemical rearrangement of 2-(<i>N</i>
-allyl-<i>N</i>
-alkylamino)cyclohex-2-enones
作者:Catherine Meyer、Jean-Pierre Pete、Olivier Piva
DOI:10.1002/recl.19951141113
日期:——
Irradiation at 366 nm of 2-(N-allyl-N-alkylamino)cyclohex-2-enones led, surprisingly, to very unstable 1-azaspiro[2.5]octan-4-ones rather than to the expected [2 + 2] intramolecular photo-cycloaddition. The corresponding alcohols could be isolated in good yield by reduction of the crude reaction mixture. When the reaction was carried out in a mixture of acetone/D2O (9/1), incorporation of one deuterium
令人惊讶地,在366 nm处照射2-(N-烯丙基-N-烷基氨基)环己基-2-烯酮导致非常不稳定的1-azaspiro [2.5] octan-4-ones而不是预期的[2 + 2]分子内光环加成。通过还原粗反应混合物,可以高收率分离出相应的醇。当反应在丙酮/ D 2 O(9/1)的混合物中进行时,观察到掺入了一个氘原子。拟议的机制涉及在第一步中进行分子内γ-H提取,然后对7-氮杂双环[4.2.0] octan-1-ol中间体进行分子重排。