Facile Rearrangement of the 6,11-Diphenyldibenzo[<i>b</i>,<i>f</i>][1,4]diazocine Skeleton into a Substituted 2-(2-Aminophenyl)-1,3-diphenylisoindole via Anomalous Carbolithiation or Hydrolithiation: Corroboration of Operative SET Processes
作者:John J. Eisch、Wei Liu、Lisheng Zhu、Arnold L. Rheingold
DOI:10.1002/ejoc.201500917
日期:2015.11
The starting 6,11-diphenyldibenzo[b,f][1,4]diazocine has been individually treated with R–Li reagents in THF, where R = AlH4, PhCH2, Ph2CH, Ph3C, CH3, CH3(CH2)3, C6H5 or Ph–C≡C, to learn whether an expected 1,2- or 1,4-addition would cleanly occur. Contrary to such an assumption based on nucleophilic attack, this [1,4]diazocine with PhCH2Li yielded only the enantiomers of (4b,11R)-11-benzyl-4b,11-diphenyl-4b
起始的 6,11-二苯基二苯并[b,f][1,4]重氮辛已在 THF 中用 R–Li 试剂单独处理,其中 R = AlH4、PhCH2、Ph2CH、Ph3C、CH3、CH3(CH2)3、C6H5或Ph–C≡C,以了解预期的1,2-或1,4-加成是否会完全发生。与基于亲核攻击的这种假设相反,这种 [1,4] 重氮辛与 PhCH2Li 仅产生 (4b,11R)-11-苄基-4b,11-二苯基-4b,11-二氢-5H-苯并[ 4,5]咪唑并[2,1-a]异吲哚;用Ph2CHLi生成2-[1-(4-二苯甲基苯基)-苯基-2H-异吲哚-2-基]苯胺;和 LiAlH4 2-(2-氨基苯基)-1,3-二苯基异吲哚。最后,[1,4] 重氮辛与 CH3Li、nBuLi 或 PhLi 的单独反应产生了 4-5 个不可分离的产物,而不是任何简单的 1,2 或 1,4 加合物。