Catalytic Intermolecular Dicarbofunctionalization of Styrenes with CO<sub>2</sub>
and Radical Precursors
作者:Veera Reddy Yatham、Yangyang Shen、Ruben Martin
DOI:10.1002/anie.201706263
日期:2017.8.28
A redox‐neutral intermolecular dicarbofunctionalization of styrenes with CO2 at atmospheric pressure and carbon‐centered radicals is described. This mild protocol results in multiple C−C bond‐forming reactions from simple precursors in the absence of stoichiometric reductants, thus exploiting a previously unrecognized opportunity that complements existing catalytic carboxylation events.
Direct and Chemoselective Synthesis of Tertiary Difluoroketones via Weinreb Amide Homologation with a CHF<sub>2</sub>-Carbene Equivalent
作者:Margherita Miele、Andrea Citarella、Nicola Micale、Wolfgang Holzer、Vittorio Pace
DOI:10.1021/acs.orglett.9b03024
日期:2019.10.18
Weinreb amides into difluoromethylketones with a formal nucleophilic CHF2 transfer agent is reported. Activating TMSCHF2 with potassium tert-amylate enables a convenient access to the difluorinated homologation reagent, which adds to the acylating partners. The high chemoselectivity showcased in the presence of variously multifunctionalized Weinreb amides, jointly with uniformly high yields, enables the
Modular and Chemoselective Strategy for Accessing (Distinct) α,α‐Dihaloketones from Weinreb Amides and Dihalomethyllithiums
作者:Saad Touqeer、Raffaele Senatore、Monika Malik、Ernst Urban、Vittorio Pace
DOI:10.1002/adsc.202001106
日期:2020.11.18
The selective transfer of diversely functionalized dihalomethyllithiums (LiCHBrCl, LiCHClI, LiCHBrI, LiCHCl2, LiCHBr2, LiCHFI) to Weinreb amides for preparing gem‐dihaloketones in one synthetic operation is reported. The capability of these amides as acylating agents and, the wide availability of dihalomethanes as pronucleophiles, enable a straightforward route to the title compounds under full chemocontrol
equivalents containing a Weinrebamide as one of the functionalities have been synthesized from commercially available o-, m-, and p-toluic acid. These bifunctional buildingblocks enabled efficient C-C bond formation through Wittig reaction with simple and functionalized aldehydes on one hand and a clean nucleophilic addition of 3,4,5-trimethoxy phenylmagnesium bromide onto the Weinrebamide functionality on
rare 1,1-dipole synthons, allyl sulfones are rarely used in target-oriented syntheses, likely due to the lack of a general catalytic method for their branch-selective allylicsubstitution. Herein, we identified allyl 4-chlorophenyl sulfone as a versatile linchpin for both base-mediated α-derivatization and subsequent cobalt-catalyzed allylicsubstitution. The sequential transformations allow for highly