Diverse Synthesis of Chiral Trifluoromethylated Alkanes via Nickel‐Catalyzed Asymmetric Reductive Cross‐Coupling Fluoroalkylation
作者:Yue Min、Jie Sheng、Jian‐Liang Yu、Shan‐Xiu Ni、Guobin Ma、Hegui Gong、Xi‐Sheng Wang
DOI:10.1002/anie.202101076
日期:2021.4.26
drug candidates containing chiral trifluoromethyl‐bearing carbons are still few due to the lack of efficient methods for the asymmetric introduction of trifluoromethyl group into organic molecules. Herein, we described a nickel‐catalyzed asymmetric trifluoroalkylation of aryl iodides, for the first time, by utilizing reductive cross‐coupling in enantioselective fluoroalkylation. This novel method has demonstrated
Metallaphotoredox Perfluoroalkylation of Organobromides
作者:Xiangbo Zhao、David W. C. MacMillan
DOI:10.1021/jacs.0c09977
日期:2020.11.18
Ruppert-Prakash type reagents (TMSCF3, TMSC2F5, and TMSC3F7) are readily available, air-stable, and easy-to-handle fluoroalkyl sources. Herein, we describe a mild, copper-catalyzed cross-coupling of these fluoroalkyl nucleophiles with aryl and alkyl bromides to produce a diverse array of trifluoromethyl, pentafluoroethyl, and heptafluoropropyl adducts. This light-mediated transformation proceeds via
Aryl Amination Using Soluble Weak Base Enabled by a Water-Assisted Mechanism
作者:Sii Hong Lau、Peng Yu、Liye Chen、Christina B. Madsen-Duggan、Michael J. Williams、Brad P. Carrow
DOI:10.1021/jacs.0c09275
日期:2020.11.25
and amide type nucleophiles together with tolerance for a range of base-sensitive functionalgroups. Mechanistic data have established a unique pathway for these reactions in which water serves multiple beneficial roles. In particular, ionization of a neutral catalytic intermediate via halide displacement by H2O generates, after proton loss, a coordinatively unsaturated Pd-OH species that can bind amine
Nickel‐Catalyzed Thermal Redox Functionalization of C(sp
<sup>3</sup>
)−H Bonds with Carbon Electrophiles**
作者:Yuxin Gong、Lei Su、Zhaodong Zhu、Yang Ye、Hegui Gong
DOI:10.1002/anie.202201662
日期:2022.5.23
Under thermal conditions, nickel-catalyzed C(sp3)−Hredoxfunctionalization with carbonelectrophiles has been advanced to forge value-added C(sp3)−C bonds in good to excellent efficiency. This method emphasizes the use of external Zn as reductant and di-tert-butyl peroxide as an oxidant and shows remarkable compatibility with Ni-catalysis.
Umpolung Ala
<sup>B</sup>
Reagents for the Synthesis of Non‐Proteogenic Amino Acids, Peptides and Proteins**
作者:Feng Zhu、Eric Miller、Wyatt C. Powell、Kelly Johnson、Alexander Beggs、Garrett E. Evenson、Maciej A. Walczak
DOI:10.1002/anie.202207153
日期:2022.8
A novel aminoacid synthon in the form of boronoalanine (AlaB) suitable for umpolung peptide/protein functionalization is described. It is demonstrated that AlaB can be incorporated into peptides and proteins, and remains stable under solid-phase synthesis, native chemical ligation, and radical desulfurization. Furthermore, AlaB is a competent partner in inter(intra)molecular C(sp3)−C(sp2) cross-couplings