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.
General Method for the Suzuki–Miyaura Cross-Coupling of Primary Amide-Derived Electrophiles Enabled by [Pd(NHC)(cin)Cl] at Room Temperature
作者:Peng Lei、Guangrong Meng、Yun Ling、Jie An、Steven P. Nolan、Michal Szostak
DOI:10.1021/acs.orglett.7b03191
日期:2017.12.15
temperature Suzuki–Miyauracross-coupling of commonly encountered primary benzamides is reported. A combination of site-selective N,N-di-Boc-activation (tert-butoxycarbonyl activation) of the amide nitrogen with practical air- and moisture-stable, well-defined, and highly reactive [Pd(NHC)(cin)Cl] (NHC = N-heterocyclic carbene; cin = cinnamyl) provides a highly effective route to biarylketones from primary
A base-initiated thioesterification of amides with various thiols is reported. This reaction can take place efficiently under metal-free and air-atmospheric conditions, and provides a facile and practically useful approach to the synthesis of valuable acyl thioesters.
An environmentally friendly palladium‐catalyzed Suzuki–Miyauracoupling reaction of twisted amides with potassium aryl trifluoroborates has been developed, generating ketones under pure water phase, room temperature, and ligand‐free condition.
Palladium/NHC (NHC = <i>N</i>-Heterocyclic Carbene)-Catalyzed B-Alkyl Suzuki Cross-Coupling of Amides by Selective N–C Bond Cleavage
作者:Guangrong Meng、Michal Szostak
DOI:10.1021/acs.orglett.8b02911
日期:2018.11.2
carbene)-catalyzed, direct cross-coupling between B-sp3-alkyl reagents and activated amides by N–C(O) cleavage is reported. Palladium-NHC precatalysts promote chemoselective alkylations of amides that are inaccessible by applying strong organometallic reagents. Various amides, including challenging primary amides after direct and site-selective N,N-di-Boc activation, are compatible with this method. The