Catalyst‐free Decarboxylation and Decarboxylative Giese Additions of Alkyl Carboxylates through Photoactivation of Electron Donor‐Acceptor Complex
作者:Chao Zheng、Guang‐Zu Wang、Rui Shang
DOI:10.1002/adsc.201900803
日期:2019.10.8
report herein a catalyst‐free method to perform decarboxylative conjugated addition and hydrodecarboxylation of aliphatic N‐(acyloxy)phthalimides (redox active esters, RAEs) through photoactivation of electron‐donor‐acceptor (EDA) complex with Hantzsch ester (HE) in N,N‐dimethylacetamide (DMA) solution. The reactions present a green method to decarboxylatively construct carbon‐carbon bond and to perform
Defunctionalization of sp<sup>3</sup> C–Heteroatom and sp<sup>3</sup> C–C Bonds Enabled by Photoexcited Triplet Ketone Catalysts
作者:Yiting Gu、Hongfei Yin、Matthew Wakeling、Juzeng An、Ruben Martin
DOI:10.1021/acscatal.1c05329
日期:2022.1.21
defunctionalization of sp3 C–heteroatom and sp3 C–C bonds with tripletketone catalysts and bipyridine additives is disclosed. This protocol is characterized by its broad scope without recourse to transition metal catalysts or stoichiometric exogeneous reductants, thus offering a complementary technique for activating σ sp3 C–C(heteroatom) bonds. Preliminary mechanistic studies suggest that the presence
Chemoselective Decarboxylative Protonation Enabled by Cooperative Earth‐Abundant Element Catalysis
作者:Yen‐Chu Lu、Julian G. West
DOI:10.1002/anie.202213055
日期:2023.1.16
Combining simple iron and thiol catalysts allows carboxylic acids to be directly converted to C−H bonds under visible light irradiation. The cocatalytic system exhibits a wide scope, is scalable, and preliminary mechanistic studies suggest it functions via a tandem ligand-to-metal charge transfer (LMCT)/Hydrogen Atom Transfer (HAT) mechanism.
probably proceeds via Dexter energy transfer between the activated catalyst and the Barton ester. Furthermore, a one-pot wavelength-selective reaction within the visible light range is developed in combination with a blue-light-mediated photoredox reaction, demonstrating the compatibility of two photochemical transformations based on mechanistic differences. This one-pot process expands the limits of the