Synthesis of Complex Druglike Molecules by the Use of Highly Functionalized Bench-Stable Organozinc Reagents
作者:Thomas J. Greshock、Keith P. Moore、Ray T. McClain、Ana Bellomo、Cheol K. Chung、Spencer D. Dreher、Peter S. Kutchukian、Zhengwei Peng、Ian W. Davies、Petr Vachal、Mario Ellwart、Sophia M. Manolikakes、Paul Knochel、Philippe G. Nantermet
DOI:10.1002/anie.201604652
日期:2016.10.24
representative set of 17 organozinc pivalates with 18 polyfunctional druglike electrophiles (informers) in Negishi cross‐coupling reactions was evaluated by high‐throughput experimentation protocols. The high‐fidelity scaleup of successful reactions in parallel enabled the isolation of sufficient material for biological testing, thus demonstrating the high value of these new solid zinc reagents in a drug‐discovery
benzoxazoles with aryl halides. A series of aryl, heteroaryl, and druglike electrophiles relevant to pharmaceutical applications were surveyed. The desired arylated products were obtained in synthetically useful yields using electronically and structurally varied aryl halides. The use of microscale high-throughput experimentation was essential for both the rapid identification of optimal reaction parameters
Non-innocent Radical Ion Intermediates in Photoredox Catalysis: Parallel Reduction Modes Enable Coupling of Diverse Aryl Chlorides
作者:Alyah F. Chmiel、Oliver P. Williams、Colleen P. Chernowsky、Charles S. Yeung、Zachary K. Wickens
DOI:10.1021/jacs.1c05988
日期:2021.7.28
leveraging radicalanionintermediates generated in situ. The combination of an isophthalonitrile photocatalyst and sodium formate promotes diverse arylradical coupling reactions from abundant but difficult to reduce aryl chloride substrates. Mechanistic studies reveal two parallel pathways for substrate reduction both enabled by a key terminal reductant byproduct, carbon dioxide radicalanion.
Mechanistic Analysis of Metallaphotoredox C–N Coupling: Photocatalysis Initiates and Perpetuates Ni(I)/Ni(III) Coupling Activity
作者:Nicholas A. Till、Lei Tian、Zhe Dong、Gregory D. Scholes、David W. C. MacMillan
DOI:10.1021/jacs.0c05901
日期:2020.9.16
and uncover the photochemical mechanism for reductive activation of the nickel co- catalyst. Stoichiometric organometallicstudies along with a comprehensive kinetic study of the reaction, including rate-driving force analysis, unveiled the crucial role of photocatalysis in both initiating and sustaining a Ni(I)/Ni(III) cross-coupling mechanism. The insights gleaned from this study further enabled
Profiling and Application of Photoredox C(sp<sup>3</sup>)–C(sp<sup>2</sup>) Cross-Coupling in Medicinal Chemistry
作者:Rui Zhang、Guoqing Li、Michael Wismer、Petr Vachal、Steven L. Colletti、Zhi-Cai Shi
DOI:10.1021/acsmedchemlett.8b00183
日期:2018.7.12
Recent visible-light photoredox catalyzed C(sp3)–C(sp2) cross-coupling provides a novel transformation to potentially enable the synthesis of medicinal chemistry targets. Here, we report a profiling study of photocatalytic C(sp3)–C(sp2) cross-coupling, both decarboxylative coupling and cross-electrophile coupling, with 18 pharmaceutically relevant aryl halides by using either Kessil lamp or our newly