NaN3-ROH/ArOH has been found to be an efficient reagent for 1,3-amino alkoxylation and 1,3-amino phenolation of a maleimide-derived MBH adduct of isatin via domino azidation-Michael addition. Following this protocol, with NaN3-formalin, a one-pot synthesis of 3-spiro-1,2-dihydropyrrolooxazine-5,7-dione-oxindole has been achieved. In an aprotic medium, the reaction underwent an unusual amino dimerization via an aza-Diels-Alder reaction of a common allylic imine intermediate.
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http://dx.doi.org/10.1021/ol402690g | DOI Listing |
Molecules
November 2024
LAQV-REQUIMTE, Institute for Research and Advanced Studies, University of Évora, Rua Romão Ramalho, 59, 7000-641 Évora, Portugal.
The 3-component Passerini reaction (3CPR), discovered little more than 100 years ago, has been demonstrated in the last few decades to be a valuable tool for accessing structural diversity and complexity, essential topics to consider in drug discovery programs. Focusing on accessing a fine-tuned family of α-acyloxyamide-oxindole hybrids, we underline herein our latest insights regarding the use of this mild reaction approach to obtain promising anticancer agents. Cheap and commercially available isatin was used as starting material.
View Article and Find Full Text PDFACS Omega
November 2024
Department of Chemistry, Federal University of Paraíba, Campus I, João Pessoa, Paraíba 58051-900, Brazil.
This work shows the synthesis of a series of Morita-Baylis-Hillman adducts from isatin derivatives via an efficient green approach involving the use of a new catalyst system, a mixture of copper-manganese iminodiacetate 1D coordination polymer (Cu/Mn-IDA) and choline chloride-urea deep eutectic solvent (ChCl/urea 1:2). The adducts were obtained in good to excellent yields (59-97%) with shorter reaction times. The results demonstrate for the first time the synergistic catalytic effect of the combination of deep eutectic solvent and coordination polymer on the Morita-Baylis-Hillman reactions.
View Article and Find Full Text PDFOrg Lett
September 2024
College of Chemistry, Taiyuan University of Technology, Taiyuan 030024, P. R. China.
Herein, we report an unprecedented P(NMe)-mediated reductive insertion of 1,2-dicarbonyl compounds including α-keto esters and isatins into phthalic anhydride-derived alkenes and phthalic anhydrides, which furnishes the corresponding isochroman-1-ones and isochroman-1,4-diones, respectively, in moderate to excellent yields with high chemo- and regioselectivity. Furthermore, the asymmetric version of the ring expansion reaction could be realized by using a chiral auxiliary strategy. Mechanistically, the nucleophilic attack of the Kukhtin-Ramirez adduct, generated from P(NMe) and 1,2-dicarbonyl compound, to the anhydride derivative, followed by a cascade ring-opening and ring-closure process, affords the ring expansion product.
View Article and Find Full Text PDFNat Commun
January 2024
Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066, Madhya Pradesh, India.
Proteins labelled site-specifically with small molecules are valuable assets for chemical biology and drug development. The unique reactivity profile of the 1,2-aminothiol moiety of N-terminal cysteines (N-Cys) of proteins renders it highly attractive for regioselective protein labelling. Herein, we report an ultrafast Z-selective reaction between isatin-derived Baylis Hillman adducts and 1,2-aminothiols to form a bis-heterocyclic scaffold, and employ it for stable protein bioconjugation under both in vitro and live-cell conditions.
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January 2024
Department of Chemistry, Arignar Anna Govt. Arts College, (Re-accredited by the NAAC with "B+" and Affiliated to Annamalai University, Chidambaram), Villupuram 605 602, Tamilnadu.
An easy and simple spiroannulation of the Morita-Baylis-Hillman adduct of isatin derivatives with anthracene was achieved in moderate-to-good yields (37-75%). The spiroderivatives synthesized in this work exhibited green fluorescence properties. The reaction occurred in metal-free eco-friendly K-10 clay-mediated conditions.
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