The Pd/PMe-catalyzed allylation of 1-(cyanomethyl)naphthalenes with allyl acetates proved to be - rather than α-regioselective. This reaction is thought to proceed through ligand attack of the -carbon in the arenes, electronically enriched by a cyano-stabilized α-carbanion, to the (π-allyl)palladium and a 1,5-hydrogen shift of the -hydrogen from the dearomatized intermediate.
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http://dx.doi.org/10.1021/acs.orglett.3c00534 | DOI Listing |
Zhongguo Zhong Yao Za Zhi
October 2024
State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences Beijing 100700, China.
The chemical constituents in the petroleum ether fraction of Artemisia stolonifera were investigated. Twenty compounds(1-20) were isolated from the petroleum ether fraction of A. stolonifera by silica gel, Sephadex LH-20, and ODS chromatography and semi-preparative HPLC.
View Article and Find Full Text PDFPolymers (Basel)
November 2024
Institute of Inorganic and Analytic Chemistry, Clausthal University of Technology, 38678 Clausthal-Zellerfeld, Germany.
Polyurethane (PUR) soft foams release malodorous and potentially toxic compounds when exposed to oxidative conditions. Current chamber test methods cannot distinguish between pre-existing volatiles and those formed during oxidation, nor can they assess the formation rates of oxidation products. We subjected PUR soft foam to oxidative treatment in a continuous air flow at 120 °C.
View Article and Find Full Text PDFChem Sci
December 2024
Hubei Research Center of Fundamental Science-Chemistry, Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University Wuhan Hubei 430072 China
Developing methodologies for the expedient construction of biologically important δ-valerolactones bearing a privileged azaarene moiety and a sterically congested all-carbon quaternary stereocenter is important and full of challenges. We present herein a novel multicatalytic strategy for the stereodivergent synthesis of highly functionalized chiral δ-valerolactones bearing 1,4-nonadjacent quaternary/tertiary stereocenters by orthogonally merging borrowing hydrogen and Michael addition between α-azaaryl acetates and allylic alcohols followed by lactonization in a one-pot manner. Enabled by Cu/Ru relay catalysis, this cascade protocol offers the advantages of atom/step economy, redox-neutrality, mild reaction conditions, and broad substrate tolerance.
View Article and Find Full Text PDFOrg Lett
December 2024
College of Advanced Interdisciplinary Science and Technology, Henan University of Technology, Zhengzhou 450001, China.
We developed a novel, metal-free catalytic system for synthesizing a broad range of itaconates using α-ketoacids and allylic acetate. This method, leveraging phosphine and Mes-Acr(BF) catalysts, has proven versatile, enabling the efficient itaconation of peptides, the synthesis of bioactive itaconates, and the preparation of an itaconate-based bio-orthogonal probe.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
November 2024
Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, MP, India.
We report herein a directing group-controlled, palladium-catalyzed, regio-, stereo-, and enantiospecific anti-carboxylation of unactivated, internal allenes enabled via the synergistic interplay of a rationally designed bidentate directing group, palladium catalyst, and a multifunctional acetate ligand. The corresponding trans allyl ester was obtained in excellent yields with exclusive δ-regioselectivity and anti-carboxypalladation stereocontrol. The acetate ligand of the palladium catalyst controls the regio-, stereo- and enantioselectivity in the desired transformation.
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