We report a general approach to highly functionalized ()-allylic amines by decarboxylative allylation of vinyloxazolidin-2-ones. This process engages sodium sulfinates as nucleophiles to form a new carbon-sulfur bond, utilizing a palladium catalyst generated from Pd(OAc) and diphosphine ligand dpppe. The scope of the protocol is illustrated by the synthesis of 30 representative allylic amines with high regio- and stereoselectivity. Mechanistic studies show that the -selectivity of the reaction stems from the formation of a palladacycle intermediate through Pd-N chelation. The synthetic utility of this method was further exemplified by the gram-scale synthesis and subsequent transformations to various compounds.
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http://dx.doi.org/10.1039/d3cc02237d | DOI Listing |
Chem Res Toxicol
January 2025
Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, United States.
The algal macrolide goniodomin A (GDA) undergoes ring-cleavage under unusually mild, alkaline conditions to form mixtures of stereoisomers of seco acids GDA-sa and iso-GDA-sa. In the primary fragmentation pathway, opening of the macrolide ring occurs by displacement of the carboxyl group by a base-catalyzed attack of the C32 hemiketal hydroxy group on C31, yielding an oxirane-carboxylic acid, named goniodomic acid. The oxirane ring is unstable, undergoing solvolytic opening to form mainly GDA-sa.
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 PDFOrg Lett
December 2024
Institut für Chemie, Universität Oldenburg, D-26129 Oldenburg, Germany.
Optically active spirocycles were prepared in a sequence of two palladium-catalyzed reactions. In the first step, racemic α-(-iodophenyl)-β-oxo allyl esters were submitted to the palladium-catalyzed decarboxylative asymmetric allylic alkylation reaction, furnishing the α-allylated products with a quaternary stereocenter with good yields and enantioselectivities. Subsequently, these intermediate products were converted in a Heck reaction yielding the spirocyclic structures as a mixture of - and -cyclic regioisomers.
View Article and Find Full Text PDFJ Am Chem Soc
December 2024
Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
Euphorbialoid A () belongs to the rare diterpenoid family of premyrsinanes and exhibits potent anti-inflammatory effects. The 5/7/6/3-membered carbocycle (ABCD-ring) of contains 11 contiguous stereocenters and seven oxygen-containing functional groups. Moreover, four of the six hydroxy groups of are concentrated in the southern sector and flanked by four structurally different acyl groups.
View Article and Find Full Text PDFOrg Biomol Chem
November 2024
Department of Chemistry, Jilin Institute of Chemical Technology, 45 Chengde Street, Jilin City, 132022, People's Republic of China.
Highly regioselective tungsten (W)-catalyzed decarboxylative allylic amination of allylic carbamates has been developed. Allylic carbamates can be generated from readily available allylic alcohols and commercially available isocyanates. In the presence of a tungsten catalyst, branched allylic amines could be obtained in moderate to good yields with excellent regioselectivities (b/l > 20 : 1), and CO is the only byproduct.
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