Atroposelective synthesis of axially chiral biaryls by palladium-catalyzed C-H olefination, using tert-leucine as an inexpensive, catalytic, and transient chiral auxiliary, has been realized. This strategy provides a highly efficient and straightforward access to a broad range of enantioenriched biaryls in good yields (up to 98 %) with excellent enantioselectivities (95 to >99 % ee). Kinetic resolution of trisubstituted biaryls bearing sterically more demanding substituents is also operative, thus furnishing the optically active olefinated products with excellent selectivity (95 to >99 % ee, s-factor up to 600).

The site-selective functionalization of unactivated C(sp )-H bonds remains one of the greatest challenges in organic synthesis. Herein, we report on the site-selective δ-C(sp )-H alkylation of amino acids and peptides with maleimides via a kinetically less favored six-membered palladacycle in the presence of more accessible γ-C(sp )-H bonds. Experimental studies revealed that C-H bond cleavage occurs reversibly and preferentially at γ-methyl over δ-methyl C-H bonds while the subsequent alkylation proceeds exclusively at the six-membered palladacycle that is generated by δ-C-H activation. The selectivity can be explained by the Curtin-Hammett principle. The exceptional compatibility of this alkylation with various oligopeptides renders this procedure valuable for late-stage peptide modifications. Notably, this process is also the first palladium(II)-catalyzed Michael-type alkylation reaction that proceeds through C(sp )-H activation.

The discovery of proper ligands to simultaneously modulate the reactivity and effectively control the stereoselectivity is a central topic in the field of enantioselective C−H activation. Herein, we reported the synthesis of axially chiral biaryls by Pd‐catalyzed atroposelective C−H olefination. A novel chiral spiro phosphoric acid, STRIP, was identified as a superior ligand for this transformation. A broad range of axially chiral quinoline derivatives were synthesized in good yields with excellent enantioselectivities (up to 98 % ee). Density functional theory was used to gain a theoretical understanding of the enantioselectivities in this reaction.

A simple and ubiquitously present group, free amine, is used as a directing group to synthesize axially chiral biaryl compounds by PdII‐catalyzed atroposelective C−H olefination. A broad range of axially chiral biaryl‐2‐amines can be obtained in good yields with high enantioselectivities (up to 97 % ee). Chiral spiro phosphoric acid (SPA) proved to be an efficient ligand and the loading could be reduced to 1 mol % without erosion of enantiocontrol in gram‐scale synthesis. The resulting axially chiral biaryl‐2‐amines also provide a platform for the synthesis of a set of chiral ligands.

A Pd(II)-catalyzed sulfonylation of unactivated C(sp(3))-H bonds with sodium arylsulfinates using an 8-aminoquinoline auxiliary is described. This reaction demonstrates excellent functional group tolerance with respect to both the caboxamide starting material and the sodium arylsulfinate coupling partner, affording a broad range of aryl alkyl sulfones. Moreover, the late-stage modification of complex molecules was achieved via this sulfonylation protocol.

Silicon-containing peptides hold great promise for maintaining or enhancing biological activity, while simultaneously improving the proteolytic stability. Herein, we report the Pd(II)-catalyzed γ-C(sp 3 )−H silylation of αamino acids and peptides. Quinone-type ligands play a pivotal role in this reaction, and hexamethyldisilane was used as silylation reagent. The facile removal of a picolinamide auxiliary and the compatibility with a wide range of oligopeptides bearing various α-amino acid residues render this protocol a valuable strategy to access γ-silyl-α-amino acids and peptides. This reaction enriches the chemical toolbox for the site-specific peptide modification and showcases the vast potential of postsynthetic diversification of peptides via late-stage C(sp 3 )−H functionalization.

An asymmetric C-H functionalization strategy with L-pGlu-OH as chiral ligand has been developed for the atroposelective synthesis of styrene atropisomers with open-chained alkene. The strategy allows quick access to a wide range of enantioenriched axially chiral styrenes in high yields and enantioselectivities. The axially chiral styrene-derived chiral acids have been demonstrated to be an efficient type of chiral ligands in Co(III)-catalyzed enantioselective CÀH amidation reactions.

Peptides hold great promise in proteomics, diagnostics and drug discovery. While natural peptides continue to be of key importance, chemically modified unnatural peptides have been found to show enhanced biological...