A Pd-catalyzed atroposelective C-H allylation with 1,1-disubstituted alkenes was developed for the synthesis of enantioenriched -aryl peptoid atropisomers via β-H elimination using commercially available and inexpensive L-Glu-OH as a chiral ligand. Exclusive allylic selectivity was achieved. Additionally, a series of enantioenriched -aryl peptoid atropisomers were obtained in synthetically useful yields with excellent enantioselectivities (up to 90% yield and 97% ee).
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http://dx.doi.org/10.1021/acs.orglett.1c03967 | DOI Listing |
J Am Chem Soc
December 2024
Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, China.
We report herein a one-step synthesis of valuable enantioenriched piperidines and tetrahydroisoquinolines from readily available racemic 1,5-diols. Key to the success is the development of new iridacycle catalysts that enable efficient redox-neutral construction of two C-N bonds between diols and amines in an enantioconvergent fashion. Mechanistic studies identified an intriguing preferential oxidation of secondary versus primary alcohol in the diol substrate by the iridacycle catalyst, which set a challenging intermolecular amination of aryl-alkyl-substituted alcohol as the enantiodetermining step for this catalytic -heterocycle synthesis.
View Article and Find Full Text PDFJ Am Chem Soc
December 2024
State Key Laboratory of Chemical Oncogenomics, Institute of Biopharmaceutics and Health Engineering, Tsinghua Shenzhen International Graduate School, Shenzhen 518055, China.
The high percentage of sp-hybridized carbons and the presence of chiral carbon centers could contribute to increased molecular complexity, enhancing the likelihood of clinical success of drug candidates. Three-dimensional (3D) bridged motifs have recently garnered significant interest in medicinal chemistry. Bicyclo[2.
View Article and Find Full Text PDFOrg Lett
November 2024
Research Center of Green Pharmaceutical Technology and Process, Hubei Key Laboratory of Natural Products Research and Development, College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, China.
A method for the efficient synthesis of chiral cycloallylalcohols has been developed, achieving excellent yields and enantioselectivities (>99% conversion, turnover number of ≤50 000, and >99% ee). This approach accommodates a variety of cycloalkenones with different aryl substituents and is tolerant of a broad range of functional groups. The synthetic utility of this method has been demonstrated through gram-scale synthesis and subsequent transformations into diverse enantioenriched oxygen-containing compounds.
View Article and Find Full Text PDFJ Am Chem Soc
November 2024
Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States.
Cu-catalyzed enantioconvergent cross-coupling of alkyl halides has emerged as a powerful strategy for synthesizing enantioenriched molecules. However, this approach is intrinsically limited by the weak reducing power of copper(I) species, which restricts the scope of compatible nucleophiles and necessitates extensive ligand optimization or the use of complex chiral scaffolds. To overcome these challenges, we introduce an aryl-radical-enabled strategy that decouples the alkyl halide activation step from the chiral Cu center.
View Article and Find Full Text PDFRSC Adv
October 2024
CNR ICCOM, Dipartimento di Chimica, Università di Bari via Orabona 4 70125 Bari Italy
Our enantioselective oxidation protocol, based upon hydroperoxides in the presence of a titanium/(,)-hydrobenzoin catalyst, was tested for the first time with aryl benzyl sulfides containing heterocyclic moieties (2-thienyl, 2-pyridyl and benzimidazolyl), two of them being connected with the blockbuster omeprazole drug. Good yields of enantiopure sulfoxides were obtained in most cases. Two exceptions of unsatisfactory enantioselectivity in the oxidation of benzimidazolyl sulfides are reported.
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