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We present a highly deuterium atom economical approach for the synthesis of deuterated alcohols via the single electron transfer (SET) reductive deuteration of acyl chlorides. Cost-effective sodium dispersion and EtOD- were used as the single electron donor and deuterium donor, respectively. Our approach achieved up to 49% deuterium atom economy, which represents the highest deuterium atom economy yet achieved in SET reductive deuteration reactions. With all 20 tested substrates, excellent regioselectivity and >92% deuterium incorporations were obtained. Furthermore, we demonstrated the potential of this methodology by synthesizing four deuterated analogues of pesticides.
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http://dx.doi.org/10.1021/acs.orglett.3c04155 | DOI Listing |
We demonstrate the fabrication of an optical nanofiber cavity designed for efficient interface with ytterbium (Yb) atoms at telecom-wavelength transitions. Replacing the conventional hydrogen-oxygen flame with a deuterium-oxygen flame in the heat-and-pull method suppresses hydroxyl-induced absorption losses and enables low-loss nanofiber production with minimal modifications to the existing fabrication system. Using this technique, we fabricate a nanofiber cavity at 1389 nm that exhibits an intrinsic round-trip loss of 0.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
August 2025
Max-Planck-Institut für Kohlenforschung, Mülheim/Ruhr, 45470, Germany.
The readily accessible iron complex [Cp*FeCl(tmeda)] is an effective catalyst for the highly regio- and stereoselective trans-hydrostannylation of terminal alkyl alkynes, affording a type of alkenylstannanes that is difficult to make otherwise. The RSn- moiety is faithfully delivered to the terminal C-atom, unless a propargylic or homo-propargylic ─OH or ─NH group is present in the substrate, which (partly or fully) inverts the regiochemical course; this steering effect, however, can be switched off upon protection of the protic site. The trans-addition likely starts by insertion of the [Cp*FeCl] fragment into the RSn─H bond, followed by a migratory insertion of the ligated alkyne into the Fe─Sn unit of the Fe(IV) species thus formed.
View Article and Find Full Text PDFJ Am Chem Soc
August 2025
Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695 United States.
The biosynthesis of neuroexcitatory kainoids requires radical-mediated cyclization of -isoprenylated derivatives of l-glutamate catalyzed by nonheme iron and 2-oxoglutarate-dependent enzymes. While KabC and DabC from species of red algae catalyze this reaction during the biosynthesis of kainic acid and domoic acid, respectively, KabC can also produce a bicyclic lactone as an alternative reaction product. Herein, the radical-mediated catalytic pathways of KabC and DabC with the substrate -dimethylallyl l-glutamate are fully mapped demonstrating as many as three different product determining steps and competing processes of hydroxylation, C-C bond formation, intramolecular nucleophilic addition, desaturation and C-C bond cleavage leading to four different products including kainic acid, a bicyclic lactone, a hydroxylated product and oxidative rearrangement concomitant with elimination of formaldehyde.
View Article and Find Full Text PDFPhys Chem Chem Phys
August 2025
Institute of Chemistry, University of São Paulo, 05508-000 São Paulo, Brazil.
The photophysical study of decarboxyranelic acid (DRAc), a thiophene derivative made from strontium ranelate, shows that it can form long-lived radical cation species through a pathway involving triplet states. Femtosecond transient absorption spectroscopy and computational modeling reveal a fast intersystem crossing (ISC) process in water, with a time constant of 1.1 ps and a quantum yield of 27%.
View Article and Find Full Text PDFJ Org Chem
August 2025
College of Sciences, Tianjin University of Science & Technology, Tianjin 300457, P. R. China.
An efficient base-mediated sequential Michael addition/[2,3]-sigmatropic rearrangement between vinylsulfonium salts and -nucleophiles has been developed, leading to a series of functionalized benzylic thioethers in 52-95% yields with high chemoselectivity, regioselectivity, and atom economy. The protocol enables mild conditions, is easy to manipulate, and exhibits a wide substrate range with good functional group tolerance. The viability of the method is also illustrated by gram-scale synthesis and further modification of target products and drug molecules, making it a valuable tool for drug discovery.
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