Palladium(II)-Catalyzed Ortho-Arylation of Benzylic Phosphonic Monoesters Using Potassium Aryltrifluoroborates
摘要:
The new monophosphonic acid directing group was successfully utilized in the Pd (II)-catalyzed orthoarylation of benzylic phosphonic monoesters using potassium aryltrifluoroborates. A wide range of benzylic phosphonic monoesters underwent clean ortho-arylation in high yields, and excellent functional group tolerance was also observed.
Abstract Two new bis(bibenzyl) ethers, perrottetin E-11′-methyl ether and 14-hydroxyperrottetin E-11′-methyl ether were isolated from an ethyl acetate extract of the liverwort Pelliaendiviifolia together with the previously known bis(bibenzyl) ether, perrottetin E and their structures characterized by spectroscopic methods, chemical evidence and total synthesis. The present results strongly support