Expedient Dual Co/Organophotoredox Catalyzed Stereoselective Synthesis of All‐Carbon Quaternary Centers
作者:Àlex Cristòfol、Bart Limburg、Arjan W. Kleij
DOI:10.1002/anie.202103479
日期:2021.7.5
An efficient and attractive Co/organophotoredox dualcatalysis protocol has been developed allowing the stereoselective access to a wide variety of syn-configured 1,3-diols featuring quaternary carbon centers. The synthesis of the target molecules is achieved under ambient reaction conditions using modular and accessible reagents, substituted vinyl cyclic carbonates and aldehydes, and in short reaction
strategically novel Pd-catalyzed nucleophilic addition induced allylic alkylation reaction (NAAA) of allenoates has been successfully accomplished. By judiciously integrating ZnCl2-promoted Michael addition with Pd-catalyzed allylic alkylation, allenoates readily undergo allyl-sunfonylation at the internaldoublebond, thus providing a straightforward avenue for the rapid assembly of a host of structurally
Enantioselective Construction of All-Carbon Quaternary Centers by Branch-Selective Pd-Catalyzed Allyl–Allyl Cross-Coupling
作者:Ping Zhang、Hai Le、Robert E. Kyne、James P. Morken
DOI:10.1021/ja2039248
日期:2011.6.29
The Pd-catalyzed cross-coupling of racemic tertiary allylic carbonates and allylboronates is described. This reaction generates all-carbonquaternarycenters in a highly regioselective and enantioselective fashion. The outcome of these reactions is consistent with a process that proceeds by way of 3,3'-reductive elimination of bis(η(1)-allyl)palladium intermediates. Strategies for distinguishing the
Synergistic Cu/Pd Catalysis for Enantioselective Allylation of Ketimine Esters: The Direct Synthesis of α-Substituted α-Amino Acids and 2<i>H-</i>
Pyrrols
作者:Liang Wei、Lu Xiao、Chun-Jiang Wang
DOI:10.1002/adsc.201800986
日期:2018.12.21
An efficient synergistic Cu/Pd catalyzed enantioselective α‐allylation of acyclic ketimine esters has been reported, which provides an entry to nonproteinogenic α‐allyl α‐amino acids in high yield, exclusive regioselectivity, and excellent enantioselectivity. Moreover, the more challenging cyclic ketimine ester could also be employed as a nucleophile for the construction of 3,4‐dihydro‐2H‐pyrrole derivatives
Stereoselective Three-Component Allylic Alkylation Enabled by Dual Photoredox/Ni Catalysis
作者:Qian Zeng、Fengyun Gao、Jordi Benet-Buchholz、Arjan W. Kleij
DOI:10.1021/acscatal.3c01686
日期:2023.6.2
modular and practical approach has been developed for the stereoselective formation of elaborate allylic alcohols through a three-component reaction (3CR) between vinyl cyclic carbonates, olefins, and various radical precursors using dual photoredox/Ni catalysis. The developed process expands the potential of radical-based allylicalkylation to multicomponent approaches under high regio- and stereocontrol