Metal-Reductant-Free Electrochemical Nickel-Catalyzed Couplings of Aryl and Alkyl Bromides in Acetonitrile
作者:Robert J. Perkins、Alexander J. Hughes、Daniel J. Weix、Eric C. Hansen
DOI:10.1021/acs.oprd.9b00232
日期:2019.8.16
attractive approach for the synthesis of complex molecules at both small and large scale, two barriers for large-scale applications have remained: the use of stoichiometric metalreductants and a need for amide solvents. In this communication, new conditions that address these challenges are reported. The nickel-catalyzed reductive cross-coupling of aryl bromides with alkyl bromides can be conducted in a
A Ball-Milling-Enabled Cross-Electrophile Coupling
作者:Andrew C. Jones、William I. Nicholson、Jamie A. Leitch、Duncan L. Browne
DOI:10.1021/acs.orglett.1c02096
日期:2021.8.20
cross-electrophile coupling of aryl halides and alkyl halides enabled by ball-milling is herein described. Under a mechanochemical manifold, the reductive C–C bond formation was achieved in the absence of bulk solvent and air/moisture sensitive setups, in reaction times of 2 h. The mechanical action provided by ball milling permits the use of a range of zinc sources to turnover the nickelcatalyticcycle, enabling
Synthesis of Alkyl Indium Reagents by Using Unactivated Alkyl Chlorides and Their Applications in Palladium-Catalyzed Cross-Coupling Reactions with Aryl Halides
An efficient method for the preparation of alkyl indium reagents by using unactivated and cheap alkyl chlorides as substrates in the presence of indium and LiI was developed. The thus-formed alkyl indium species effectively underwent palladium-catalyzed cross-couplingreactions with aryl halides with wide functional group tolerance.
Mechanochemical Activation of Zinc and Application to Negishi Cross-Coupling
作者:Qun Cao、Joseph L. Howard、Emilie Wheatley、Duncan L. Browne
DOI:10.1002/anie.201806480
日期:2018.8.27
A form independent activation of zinc, concomitant generation of organozinc species and engagement in a Negishi cross‐coupling reaction via mechanochemical methods is reported. The reported method exhibits a broad substrate scope for both C(sp3)–C(sp2) and C(sp2)–C(sp2) couplings and is tolerant to many important functional groups. The method may offer broad reaching opportunities for the in situ generation
Visible‐Light‐Mediated Liberation and In Situ Conversion of Fluorophosgene
作者:Daniel Petzold、Philipp Nitschke、Fabian Brandl、Veronica Scheidler、Bernhard Dick、Ruth M. Gschwind、Burkhard König
DOI:10.1002/chem.201804603
日期:2019.1.2
to its fragmentation into fluorophosgene and benzonitrile. The in situ generated fluorophosgene was used for the preparation of carbonates, carbamates, and urea derivatives in moderate to excellent yields via an intramolecular cyclization reaction. Transient spectroscopicinvestigations suggest the formation of a catalyst charge‐transfer complex‐dimer as the catalytic active species. Fluorophosgene