Synthesis of Active Hexafluoroisopropyl Benzoates through a Hydrogen-Bond-Enabled Palladium(II)-Catalyzed C−H Alkoxycarbonylation Reaction
作者:Yang Wang、Vladimir Gevorgyan
DOI:10.1002/anie.201611757
日期:2017.3.13
A PdII‐catalyzed ortho C−H alkoxycarbonylation reaction of aryl silanes toward active hexafluoroisopropyl (HFIP) benzoateesters has been developed. This efficient reaction features high selectivity and good functional‐group tolerance. Notably, given the general nature of the silyl‐tethered directing group, this method delivers products bearing two independently modifiable sites. NMR studies reveal
Double-Fold C–H Oxygenation of Arenes Using PyrDipSi: a General and Efficient Traceless/Modifiable Silicon-Tethered Directing Group
作者:Anton V. Gulevich、Ferdinand S. Melkonyan、Dhruba Sarkar、Vladimir Gevorgyan
DOI:10.1021/ja3010545
日期:2012.3.28
The efficient Pd-catalyzed double-fold C-H oxygenation of arenes into resorcinols using the newly developed 2-pyrimidyldiisopropylsilyl (PyrDipSi) directing group is described. Its use allows for the sequential introduction of OAc and OPiv groups in a one-pot manner to produce orthogonally protected resorcinol derivatives. The PyrDipSi group is superior to the previously developed 2-pyridyldiisopropylsilyl (PyDipSi) group, as it is efficient for monooxygenation of ortho-substituted arenes. Notably, the PyrDipSi group can be easily installed into arene molecules and can be easily removed or modified after the oxygenation reaction.