A new copper and silver‐mediated cyanation of aryliodides with DDQ as a cyanidesource is achieved, providing nitriles with good yields. This new approach represents a safe method leading to aryl nitriles.
Pd-Catalyzed <i>ipso</i>,<i>meta</i>-Dimethylation of <i>ortho</i>-Substituted Iodoarenes via a Base-Controlled C–H Activation Cascade with Dimethyl Carbonate as the Methyl Source
作者:Zhuo Wu、Feng Wei、Bin Wan、Yanghui Zhang
DOI:10.1021/jacs.0c13057
日期:2021.3.31
the ipso- and meta-positions of the iodo group, which represents a novel strategy for meta-C–H methylation. With KOAc as the base, subsequent oxidative C(sp3)–H/C(sp3)–H coupling occurs; in this case, the overall transformation achieves triple C–H activation to form three new C–C bonds. These reactions allow expedient access to 2,6-dimethylated phenols, 2,3-dihydrobenzofurans, and indanes, which are ubiquitous
Allyl arylethers and allyl phenol derivatives were prepared starting from commercial or synthetized phenols. Either Williamson reaction or Et2AlCl catalyzed Claisen rearrangement was performed to obtain the polyoxygenated molecules. The pivotal allyl phenols were then modified by methylation, iodocyclization or electrophilic aromatic iodination to afford the polyoxygenated derivatives in good to excellent
Computed CH Acidity of Biaryl Compounds and Their Deprotonative Metalation by Using a Mixed Lithium/Zinc-TMP Base
作者:Raghu Ram Kadiyala、David Tilly、Elisabeth Nagaradja、Thierry Roisnel、Vadim E. Matulis、Oleg A. Ivashkevich、Yury S. Halauko、Floris Chevallier、Philippe C. Gros、Florence Mongin
DOI:10.1002/chem.201300552
日期:2013.6.10
of synthesizing biaryl compounds, several aromatic iodides were prepared by the deprotonative metalation of methoxybenzenes, 3‐substituted naphthalenes, isoquinoline, and methoxypyridines by using a mixed lithium/zinc‐TMP (TMP=2,2,6,6‐tetramethylpiperidino) base and subsequent iodolysis. The halides thus obtained, as well as commercial compounds, were cross‐coupled under palladium catalysis (e.g., Suzuki