Transition‐Metal‐Free Intermolecular Hydrocarbonation of Styrenes Mediated by NaH/1,10‐Phenanthroline
摘要:
AbstractA transition‐metal‐free intermolecular coupling reaction of halocompounds with styrenes in the presence of NaH and 1,10‐phenanthroline was developed. This reaction afforded hydrocarbonated products with complete anti‐Markovnikov selectivity. The method allows the use of a wide range of halocompounds, including aryl and alkyl halides, and good functional group tolerance. Detailed mechanistic studies indicated that an anilide anion generated in situ by the NaH‐mediated reduction of 1,10‐phenanthroline works as an electron donor and a hydrogen source.
Nickel-Catalyzed Diaryl Ketone Synthesis by N–C Cleavage: Direct Negishi Cross-Coupling of Primary Amides by Site-Selective <i>N</i>,<i>N</i>-Di-Boc Activation
作者:Shicheng Shi、Michal Szostak
DOI:10.1021/acs.orglett.6b02952
日期:2016.11.18
the first amidecross-coupling by direct metal insertion of simple and readily available primary amides. The overall strategy by N,N-di-Boc activation/metal insertion is suitable for a broad range of coupling protocols via acylmetals. Mechanistic experiments suggest high reactivity of N,N-di-Boc activated 1° amides in direct amide C–N cross-couplings.
Efficient Synthesis of Diaryl Ketones by Nickel-Catalyzed Negishi Cross-Coupling of Amides by Carbon-Nitrogen Bond Cleavage at Room Temperature Accelerated by a Solvent Effect
作者:Shicheng Shi、Michal Szostak
DOI:10.1002/chem.201602202
日期:2016.7.18
Negishi cross‐coupling of amides for the synthesis of versatile diarylketones by selective C−N bond activation under exceedingly mildconditions is reported. The cross‐coupling was accomplished with bench‐stable, inexpensive precatalyst [Ni(PPh3)2Cl2] that shows high functional‐group tolerance and enables the synthesis of highly functionalizeddiarylketone motifs. The coupling occurred with excellent
Synthesis of biaryl ketones by arylation of Weinreb amides with functionalized Grignard reagents under thermodynamic control <i>vs.</i> kinetic control of <i>N</i>,<i>N</i>-Boc<sub>2</sub>-amides
作者:Guangchen Li、Michal Szostak
DOI:10.1039/d0ob00813c
日期:——
A highlyefficient method for chemoselective synthesis of biaryl ketones by arylation of Weinreb amides (N-methoxy-N-methylamides) with functionalized Grignard reagents is reported. This protocol offers rapid entry to functionalized biaryl ketones after Mg/halide exchange with i-PrMgCl·LiCl under operationally-simple and practical reaction conditions. The scope of the method is highlighted in >40 examples
investigations discovered that the generated phenylhydrazone anion was significantly bathochromically shifted to visible light region for photoactivation under irradiation. The photoexcited phenylhydrazone anion was potential to reduce aryl iodides single electron transfer process for the subsequent radical chain reaction. A redox-neutral photochemical carbonylation of aryl iodides was developed on basis of