This manuscript describes a visible-light-mediated organophotoredox catalytic process for vicinal difunctionalization of alkenes using heteroatom nucleophiles and aliphatic redox active esters. A wide range of heteroatom nucleophiles including alcohols, water, carboxylic acids, amides, and halogens can be used for this reaction. This radical relay type reaction allows forging of C(sp)-C(sp) with a carbon-centered radical and C(sp)-heteroatom bonds with a benzyl cation on the vinylarenes with complete regioselectivity in a single step.
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http://dx.doi.org/10.1021/acs.orglett.1c00211 | DOI Listing |
J Am Chem Soc
December 2024
Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States.
The development of small-molecule catalysts that can effectively activate both reacting partners simultaneously represents a pivotal pursuit in advancing the field of stereoselective glycosylation reactions. We report herein the development of the singly protonated form of readily available phenanthroline as an effective cooperative catalyst that facilitates the coupling of a wide variety of aliphatic alcohols, phenols, and aromatic amines with α-glycosyl trichloroacetimidate donors. The glycosylation reaction likely proceeds via an S2-like mechanism, generating β-selective glycoside products.
View Article and Find Full Text PDFRSC Adv
November 2024
Department of Chemical Engineering, The University of Danang, University of Science and Technology Danang Vietnam.
The free radical scavenging ability of l-tryptophan (LP) and 5-hydroxy-l-tryptophan (HLP) was evaluated using experimental and theoretical methods. The impact of antioxidant concentration on the scavenging of DPPH˙ and ABTS˙ free radicals was assessed for both compounds. The results indicated that HLP exhibited superior scavenging ability, with IC values of 31.
View Article and Find Full Text PDFJACS Au
November 2024
School of Chemistry, Sun Yat-sen University, Guangzhou 510006, P.R. China.
J Am Chem Soc
December 2024
State Key Laboratory of Green Pesticide, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Huaxi District, Guiyang 550025, China.
Enantioenriched phosphorus(V)-stereogenic compounds, featuring a pentavalent phosphorus atom as the stereogenic center, are crucial in various natural products, drugs, bioactive molecules, and catalysts/ligands. While a handful of stereoselective synthetic approaches have been developed, achieving direct stereocontrol at the phosphorus atom through catalytic generation of phosphorus(V)-heteroatom bonds continues to be a formidable challenge. Here, we disclose an organocatalytic asymmetric condensation strategy that employs a novel activation mode of stable feedstock phosphinic acids by the formation of mixed phosphinic anhydride as the reactive species to facilitate further catalyst-controlled asymmetric P-O bond formations, involving a dynamic kinetic asymmetric transformation (DYKAT) process with alcohol nucleophiles via a cinchonidine-derived bifunctional catalyst.
View Article and Find Full Text PDFOrg Lett
November 2024
School of Pharmacy, Xi'an Jiaotong University, No. 76 Yanta West Road, Xi'an, Shaanxi 710061, China.
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