In recent years, Hantzsch esters and their related organic hydride donors have been widely utilized in biomimetic approaches of asymmetric transfer hydrogenation (ATH) reactions. Various compounds containing C=C, C=N and C=O unsaturated functionalities could be reduced in the presence of organocatalysts or transition metal complexes, affording versatile chiral building blocks in high yields and excellent enantioselectivities under mild conditions. In this critical review, recent advances in this area are summarized and classified according to unsaturated functional groups being reduced and catalytic systems employed (91 references).

Transfer hydrogenation with Hantzsch esters and related organic hydride donors

The union of photoredox and nickel catalysis has resulted in a renaissance in radical chemistry as well as in the use of nickel-catalyzed transformations, specifically for carbon-carbon bond formation. Collectively, these advances address the longstanding challenge of late-stage cross-coupling of functionalized alkyl fragments. Empowered by the notion that photocatalytically generated alkyl radicals readily undergo capture by Ni complexes, wholly new feedstocks for cross-coupling have been realized. Herein, we highlight recent developments in several types of alkyl cross-couplings that are accessible exclusively through this approach.

/pdf/alkyl-carbon-carbon-bond-formation-by-nickel-photoredox-3puo4ywyah.pdf

Alkyl Carbon-Carbon Bond Formation by Nickel/Photoredox Cross-Coupling.

Recent developments in the chemistry of dihydropyridines

Organic compounds that show Thermally Activated Delayed Fluorescence (TADF) have become wildly popular as next-generation emitters in organic light emitting diodes (OLEDs). Since 2016, a subset of these have found increasing use as photocatalysts. This review comprehensively highlights their potential by documenting the diversity of the reactions where an organic TADF photocatalyst can be used in lieu of a noble metal complex photocatalyst. Beyond the small number of TADF photocatalysts that have been used to date, the analysis conducted within this review reveals the wider potential of organic donor–acceptor TADF compounds as photocatalysts. A discussion of the benefits of compounds showing TADF for photocatalysis is presented, which paints a picture of a very promising future for organic photocatalyst development.

/pdf/organic-thermally-activated-delayed-fluorescence-tadf-3g7k0v16yc.pdf

Organic thermally activated delayed fluorescence (TADF) compounds used in photocatalysis

: Catching Photons: Visible light, an amine reductant, and a Ru(bpy)32+ photocatalyst can be used to mediate the addition of glycosyl halides into alkenes to synthesize important C-glycosides. This method highlights the growing potential of photocatalysis to effectively drive useful and difficult chemical transformations.

Intermolecular Addition of Glycosyl Halides to Alkenes Mediated by Visible Light

Heterolytic and homolytic N-H bond dissociation energies of 4-substituted Hantzsch 2,6-dimethyl-1,4-dihydropyridines and the effect of one-electron transfer on the N-H bond activation.

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Heterolytic and homolytic N-H bond dissociation energies of 4-substituted Hantzsch 2,6-dimethyl-1,4-dihydropyridines and the effect of one-electron transfer on the N-H bond activation.