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Publication
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Work with us on data science and visualisation projects, and deploy your project as an app on top of Graph Search.
Alkene difunctionalization featuring an intramolecular carbometallation step has been developed into a powerful transformation in organic synthesis. The 5-exo-trig carbometallation is in general highly favored over the alternative 6-endo-trig cyclization. We report herein a formal 6-endo-trig carbofluorination protocol by combining the conventional 5-exo-trig carbopalladation with a chemoselective 1,2-aryl/Pd dyotropic rearrangement. Treatment of 2-(2-alkylallyloxy)phenyl boronic acid derivatives in the presence of a catalytic amount of Pd(dba)(2), 4,4 '-di-tert-butyl-2,2 '-bipyridine and Selectfluor affords chromanes with concurrent generation of a tertiary alkyl fluoride function. A sigma-alkyl-Pd-II species resulting from the 5-exo-trig carbopalladation process is isolated and characterized by X-ray crystallographic analysis. Its oxidation to Pd-IV complex triggers the chemoselective dyotropic rearrangement leading to the ring expansion product.
Qian Wang, Jieping Zhu, Dan Forster, Weisi Guo
Qian Wang, Jieping Zhu, Takuji Fujii
Rosario Scopelliti, Shiori Fujimori