Results 51 to 60 of about 4,192 (189)

Heterocycles by Cycloaddition. IV. Cycloaddition Reactions of Mesoionic Compounds with a 7-Azabicyclo[2.2.1]heptadiene, and Double Fragmentation of the Adducts [PDF]

Bulletin of the Chemical Society of Japan, 1976
Abstract Cycloaddition of some five-membered mesoionic compounds with dimethyl 7-tosyl-7-azabicyclo[2.2.1]hepta-2,5-diene-2,3-dicarboxylate occurs only across the unsubstituted double bond. Pyrolysis of the adducts resulted in a double fragmentation reaction to give two five-membered aromatic heterocycles.
Hiroshi Matsukubo, Hiroshi Kato
openaire   +1 more source

Light‐Driven [2 + 2] Cycloaddition Strategies for the Synthesis of Cyclobuta[b]indoles and Their Derivatives

ChemPhotoChem, Volume 10, Issue 6, June 2026.
This review surveys the literature on light‐driven dearomative [2+2] cycloadditions of indoles, highlighting their power to access complex cyclobuta[b]indole frameworks. Advances in photocatalysis, sensitizer design, and reaction engineering enable selective and sustainable assembly of strained three‐dimensional architectures, expanding opportunities ...
Maria Chiara Cabua, Davide Moi, Alberto Luridiana, Francesco Secci, Emanuele Cocco   +4 more
wiley   +1 more source

Functional Activity of Enantiomeric Oximes and Diastereomeric Amines and Cyano Substituents at C9 in 3-Hydroxy-N-phenethyl-5-phenylmorphans

Molecules
The synthesis of stereochemically pure oximes, amines, saturated and unsaturated cyanomethyl compounds, and methylaminomethyl compounds at the C9 position in 3-hydroxy-N-phenethyl-5-phenylmorphans provided μ-opioid receptor (MOR) agonists with varied ...
Hudson G. Roth, Madhurima Das, Agnieszka Sulima, Dan Luo, Sophia Kaska, Thomas E. Prisinzano, Andrew T. Kerr, Arthur E. Jacobson, Kenner C. Rice   +8 more
doaj   +1 more source

Zwitterionic Penicillin‐Derived Sulfone Inhibitor for Combating β‐Lactamase‐Mediated Antibiotic Resistance

ChemMedChem, Volume 21, Issue 9, 14 May 2026.
Combining enhanced permeability strategies with (2‐pyridyl)methylene substitution in the sulbactam scaffold led to a novel β‐lactamase inhibitor to combat β‐lactamase‐mediated resistance to β‐lactam antibiotics. The studies presented highlight the potential of compound 3 as a next‐generation β‐lactamase inhibitor for combating infections caused by ...
Diana Rodríguez, Emilio Lence, Juan C. Vázquez‐Ucha, Alejandro Beceiro, Concepción González‐Bello   +4 more
wiley   +1 more source

Chan–Lam Cross‐Coupling With Alkylboron Reagents: From Transmetallation to Radical Pathways

European Journal of Organic Chemistry, Volume 29, Issue 18, 14 May 2026.
Alkylative Chan–Lam coupling overcomes intrinsic transmetallation limitations of alkylboron reagents by engaging radical pathways. Recent advances reveal how radical and radical–polar crossover mechanisms enable mild C(sp3)—heteroatom bond formation. This minireview highlights key mechanistic insights and emerging strategies that transform alkylboron ...
Nicolas G.‐Simonian, Andrea Serafino, Luc Neuville, Géraldine Masson   +3 more
wiley   +1 more source

A Concise Approach to 2-Azabicyclo[3.3.1]nonane Derivatives from an Acyclic Precursor

, 2016
Condensation of a readily available 5-amino-2-alkenoate ester with α-unsubstituted aliphatic aldehydes leads to substituted 1,2,3,4-tetrahydropyridines. Subsequent manipulation of the ester and enamine functions gives a quick access to 2-azabicyclo[3.3.1]
José M. Gorgojo (2664220), José M. Aurrecoechea (2440651), Carlos Saornil (2664223)   +2 more
core   +1 more source

Turmeric and curcumin: From traditional medicine to modern therapeutic applications

JSFA reports, Volume 6, Issue 5, Page 160-178, May 2026.
Abstract Turmeric (Curcuma longa), a medicinal plant, has maintained its cultural and therapeutic significance over centuries in Ayurveda, Unani, and Traditional Chinese Medicine. However, novel formulations and delivery methods are being developed to address these challenges.
Azma Nadeem, Khurram Afzal, Asad Abbas, Talha Bin Iqbal, Abdul Malik, Javaria Saeed, Mutjardah Zarrish, Bipindra Pandey   +7 more
wiley   +1 more source

Copper‐ and Silver‐Catalyzed Reactions of Active Methylene Isocyanides: Facile Access to Highly Substituted Five‐ and Six‐Membered Heterocycles

Chemistry – A European Journal, Volume 32, Issue 13, 1 April 2026.
This review summarizes recent advances in copper‐ and silver‐catalyzed reactions of active methylene isocyanides for the synthesis of highly substituted five‐ and six‐membered heterocycles. Emphasis is placed on [3+n] cycloadditions, annulations, and asymmetric strategies, highlighting current limitations and future opportunities in heterocycle ...
Jimil George, Kyungsoo Oh
wiley   +1 more source

The antiprotozoal potencies of newly prepared 3-azabicyclo[3.2.2]nonanes

, 2016
3-Azabicyclo[3.2.2]nonanes are already reported as antiprotozoal agents. Structural variations were performed by attachment of several basic side chains, being part of drugs in use, to the ring nitrogen.
Faist, Johanna, Kaiser, Marcel, Brun, Reto, Weis, Robert, Ahmad, Sarfraz, Seebacher, Werner, Saf, Robert   +6 more
core   +1 more source

Studies on 1-azabicyclo compounds. XXVIII. Synthesis of 1-methyl-perhydroazocin-5-one from pyrrolizidine.

Chemical and Pharmaceutical Bulletin, 1979
Heating of pyrrolizidine N-oxide (V) with an aqueous solution of tartaric acid containing ferric nitrate gave Δ1 (8)-dehydropyrrolizidine (VI), which, on treatment with water in the presence of methyl iodide, gave 1-methyl-perhydroazocin-5-one (IX).
ARATA, YOSHIO, TANAKA, KENICHI, YOSHIFUJI, SHIGEYUKI, KANATOMO, SHOICHI   +3 more
openaire   +2 more sources