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.
Twofold Unsymmetrical CH Functionalization of PyrDipSi-Substituted Arenes: A General Method for the Synthesis of Substituted<i>meta</i>-Halophenols
作者:Dhruba Sarkar、Ferdinand S. Melkonyan、Anton V. Gulevich、Vladimir Gevorgyan
DOI:10.1002/anie.201304884
日期:2013.10.4
And the world is your oyster…︁ Sequential halogenation/oxygenationreactions of 2‐diisopropylsilylpyrimidine‐substituted arenes provide a general and efficient synthesis of substituted meta‐halophenols from simple aryl iodides (see scheme; Piv=pivaloyl). The products are poised to undergo diverse CC, CN, and CO bond‐forming reactions that enable the transformation of their framework and the introduction
世界就是你的牡蛎……︁ 2-二异丙基甲硅烷基嘧啶取代的芳烃的顺序卤化/氧化反应提供了从简单的芳基碘化物中通用且有效地合成取代的间卤代酚(参见方案;Piv=新戊酰基)。这些产品将经历各种 C C、C N 和 C O 成键反应,从而能够转变其框架并引入有价值的功能。
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