Pd‐Catalyzed C−H Alkylation of Arenes Using PyrDipSi, a Transformable and Removable Silicon‐Tethered Directing Group
作者:Dhruba Sarkar、Vladimir Gevorgyan
DOI:10.1002/chem.201602513
日期:2016.8
Pd‐catalyzed ortho‐C−H alkylation reaction of arenes using a transformable and removable Si‐tethered pyridyldiisopropylsilyl (PyrDipSi) directinggroup has been developed. In addition, the PyrDipSi directinggroup allows for an efficient sequential double‐fold C−H alkylation/oxygenation of arenes to produce meta‐alkylated phenols. This directinggroup can easily be removed or converted into valuable functionalities
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.