Domino Pd<sup>0</sup>
-Catalyzed C(sp<sup>3</sup>
)-H Arylation/Electrocyclic Reactions via Benzazetidine Intermediates
作者:Ronan Rocaboy、David Dailler、Florian Zellweger、Markus Neuburger、Christophe Salomé、Eric Clot、Olivier Baudoin
DOI:10.1002/anie.201807097
日期:2018.9.10
arylation of 2‐bromo‐N‐methylanilides leads to unstable benzazetidine intermediates that rearrange to benzoxazines through 4π electrocyclic ring‐opening and 6π electrocyclization. The introduction of a bulky, non‐activatable amide group on the nitrogen atom was key to favor the challenging reductive elimination step and disfavor undesired reaction pathways.
Pd 0催化的2-溴N-甲基苯胺的C(sp 3)-H芳基化反应会导致不稳定的苯并氮杂环丁烷中间体通过4π电环开环和6π电环化重排为苯并恶嗪。在氮原子上引入一个庞大的,不可活化的酰胺基团是支持具有挑战性的还原消除步骤并消除不良反应途径的关键。