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
Experiment and Theory of Bimetallic Pd-Catalyzed α-Arylation and Annulation for Naphthalene Synthesis
作者:Chloe C. Ence、Erin E. Martinez、Samuel R. Himes、S. Hadi Nazari、Mariur Rodriguez Moreno、Manase F. Matu、Samantha G. Larsen、Kyle J. Gassaway、Gabriel A. Valdivia-Berroeta、Stacey J. Smith、Daniel H. Ess、David J. Michaelis
DOI:10.1021/acscatal.1c02731
日期:2021.8.20
We report the synthesis of bimetallic Pd(I) and Pd(II) complexes with bidentate 2-phosphinoimidazole ligands and their catalytic activity to generate substituted naphthalenes. This process involves the coupling of an aryl iodide and 2 equiv of a ketone via sequential ketone α-arylation and then annulation to generate disubstituted and tetrasubstituted naphthalenes in a regioselective manner. Excellent
Reaction of .mu.-oxobis[(trifluoromethanesulfonato)(phenyl)iodine(III)] with group 14 propargyl derivatives and a propargyl ether
作者:Daniel A. Gately、Thomas A. Luther、Jack R. Norton、Mary M. Miller、Oren P. Anderson
DOI:10.1021/jo00050a024
日期:1992.11
The treatment of 4,4-dimethyl-l-(trimethylsilyl)-2-pentyne (4a) or 4,4-dimethyl-l-(tributylstannyl)-2-pentyne (4b) with mu-oxobis[(trifluoromethanesulfonato)(phenyl)iodine(III)] (2) gives 4,4-dimethyl-l-(2-iodophenyl)-2-pentyne (9). Deuterium labeling has confirmed that propargylation of 2 occurs ortho to the position originally occupied by the I(III). The addition of 2 equiv of 4a to 2 at -80-degrees-C results in 2 equiv each of 9, trimethylsilyl triflate (10), and tert-butyballene (11) and 1 equiv of hexamethyldisiloxane (12); in contrast, the addition of 2 equiv of 4b to 2 at -30-degrees-C results in 2 equiv each of 9 and tributylstannyl triflate (16). A mechanism that explains these product ratios is proposed. The reaction of 2-o,o'-d2 and 4b shows the negligible intramolecular kinetic isotope effect (0.99 +/- 0.01) expected for what is in effect a Claisen rearrangement. The addition of 2 to 2-butynyl (trimethylsilyl)methyl ether (20) affords the single product 21 resulting from anti addition and control of regiochemistry by the ether oxygen. Attempts to desilylate 21 to an allenyl triflate result in the regeneration of the propargyl ether 20.
Oxidative Fluoroarylation of Benzylidenecyclopropanes with HF·Py and Aryl Iodides via Iodonio-[3,3]-Rearrangement