金催化的级联反应可快速合成N-烯丙基色胺和邻炔基芳基醛中的五环吲哚[2,3- a ]喹唑烷。串联过程结合了金催化的Pictet-Spengler反应和伴随从氮原子到二苯乙烯官能团的烯丙基转移而发生的环化反应。成功地转移了各种取代的烯丙基,从而提供了高非对映选择性的典型产物,产率为60-98%。带有丁烯醇链的色胺在高非对映选择性下会进一步环化成手性半胱氨酸。
compounds, resulting from both ring closure and the transfer of the allylic group from the nitrogen to the carbon backbone. The final skeleton obtained depends on the nature of both the R2 group of the allene and the R3 group of the allylic residue. Mechanistic studies and DFT calculations allowed the determination of all the mechanistic pathways involved in these processes, stemming from a common intermediate
N‐Allyltetrahydro‐β‐carbolines bearing a pendant allene undergo unprecedented gold(I)‐catalyzed cyclizations proceeding with an allyl migration from the nitrogen to the allene moiety. The initial product of the gold‐catalyzed cyclization evolves either via isomerization or Cope rearrangement, leading to different scaffolds. Density function theory (DFT) calculations established that the allyl migration
Herein, we report an unprecedented intramolecular cross-nucleophile coupling strategy of indole tethered β-amino acrylates using a catalyst system combining λ3-iodanes and Lewis acids to achieve the chemodivergent synthesis of three unique alkaloid skeletons. It was worth noting that the acquisition of spiroindolenines and azepino[4,5-b]indoles derivatives was switchable with choice of the Lewis acids
在此,我们报告了一种前所未有的吲哚系链β-氨基丙烯酸酯的分子内交叉亲核偶联策略,该策略使用结合λ 3 -碘烷和路易斯酸的催化剂体系来实现三种独特生物碱骨架的化学发散合成。值得注意的是,螺二氢吲哚和氮杂[4,5- b ]吲哚衍生物的获得可以通过路易斯酸的选择进行切换。此外,含有内酯片段的多环螺二氢吲哚也可以通过交叉亲核偶联级联分子内缩合序列首次获得。