Results 151 to 160 of about 23,304 (219)

Photochemical Ring Opening of Cyclopropyl Silyl Ethers Enables β–β Coupling, Radical‐Polar Crossover and Annulation

Angewandte Chemie, EarlyView.
A photochemical platform enables β–β coupling of cyclopropyl silyl ethers with electron‐deficient alkenes. The resulting adducts serve as entry points into annulative and radical–polar crossover pathways, providing rapid access to fused, bridged, and spirocyclic architectures, including late‐stage scaffold diversification to diterpene‐like carbocyclic ...
Jacop Rydén, Eilidh Young, Wilma Olsson, Eskil Flodén, Mattias Tan, Sebastian Clementson   +5 more
wiley   +1 more source

Borylcyclopropanes: Synthetic Strategies and Applications

Angewandte Chemie, EarlyView.
Borylcyclopropanes (cyclopropanes bearing a boron substituent) sit at the intersection of two privileged frameworks in synthesis. This review provides the first exhaustive survey of their chemistry, spanning metal–carbene, nucleophilic cyclization, radical, hydroboration, and C─H activation routes, and documenting applications in medicinal chemistry ...
Aiza A. Butt, Joseph M. Ready
wiley   +1 more source

Bacteria on steroids

Proceedings of the National Academy of Sciences
Natalia Mrnjavac, William F. Martin
openaire   +2 more sources

Adaptive Hydrogenation of Alkynes Using CO as a Molecular Trigger to Selectively Produce Alkanes or Z‐Alkenes

Angewandte Chemie, EarlyView.
One catalyst for two products: CO acts as a molecular trigger for adaptive alkyne hydrogenation using supported Pd nanoparticles. The catalyst reversibly switches between the formation of alkanes under H2 and Z‐alkenes under H2/CO for 37 structurally diverse alkynes.
Manisha Durai, Lachlan Sharp‐Bucknall, Tim Alexander Schubert, Jacob Johny, John‐Tommes Krzeslack, Walid Hetaba, Walter Leitner, Alexis Bordet   +7 more
wiley   +1 more source

Durch anomere Amide ermöglichte divergente Synthese unsymmetrischer Harnstoffe, Carbamate, Thioester und Amide aus Aldehyden

Angewandte Chemie, EarlyView.
Eine divergente Aldehyd‐Funktionalisierungssequenz, ermöglicht durch ein anomeres Amid, erlaubt den Ein‐Topf‐Zugang zu unsymmetrischen Harnstoffen, Carbamaten, Thiocarbamaten, Thioestern und Amiden. Entscheidend für diese Transformation ist die Bildung von N‐Boc‐Hydroxamat‐Intermediaten, die als Plattformen für eine orthogonale Aktivierung über Lossen ...
Jasper L. Tyler, Meiyi Zeng, Julius Wiener, Marie‐Christin Leusmann, Colin Stein, Constantin G. Daniliuc, Frank Glorius   +6 more
wiley   +1 more source

Unified Synthesis of Unconventional α‐Polyhalogenated Amines Through Hydroaminoalkylation

Angewandte Chemie International Edition, EarlyView.
A unified, redox‐neutral method that transforms alkenes and alkynes into α‐polyhalomethyl amines using stable hemiaminal reagents is reported. This approach enables access to CF3, CF2H, CF2Cl, and CFClH motifs, expanding halogenated amine space with broad substrate scope, functional group tolerance, and applicability to late‐stage modification of drug ...
Angela K. Hofmeister, Giulia Iannelli, Péter Angyal, Augustin Malandain, Daniel Kaiser, Boris Maryasin, Hanspeter Kählig, Matteo Barel, Gaia Novarino, Nuno Maulide   +9 more
wiley   +1 more source

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Steroids

Current Opinion in Critical Care, 2002
Corticosteroids are considered to be essential stress hormones. They are secreted together with adrenocorticotropic hormone (ACTH) in response to the pulsatile secretion of corticotropin-releasing hormone from the paraventricular nucleus of the hypothalamus.
Maggy, Riad, Marianna, Mogos, Duraiyah, Thangathurai, Philip D, Lumb   +3 more
openaire   +2 more sources

Heterocyclic steroids. Steroidal pyrimidines

Experientia, 1963
Die erste Synthese eines Steroid-Analogen, in welchem Ring A zu einem Pyrimidin umgewandelt wurde, wird beschrieben. Die wichtigste Zwischenstufe 4b wurde durch Abbau von 19-nor-Testosteron gewonnen. Kondensation von 4b mit Thioharnstoff fuhrte zu 17β-Acetoxy-2,4-diazaestr-4-en-1-on-3-thion (5).
E, CASPI, D M, PIATAK
openaire   +2 more sources

STEROIDS AND STEROID-LIKE COMPOUNDS

Clinics in Sports Medicine, 1999
Athletes have been searching for an "edge" in competition as long as there has been a reward for success. Anabolic-androgenic steroids have been the most popular of these ergogenic aids when winning is the only goal. The authors present a concise review of these substances, their prevalence, efficacy, adverse effects, and legality.
J G, Blue, J A, Lombardo
openaire   +2 more sources

Somatomedins and Steroids

Hormone Research, 2008
Somatomedin levels measured by radioreceptor assay, competitive protein-binding assay or radioimmunoassay are normal in hypercortisolism; the decrease of somatomedin activity consistently found in this condition is due to an increase in circulating somatomedin inhibitors resulting in an inhibition of somatomedin action. Progestagens could possibly have
Caufriez, Anne, Copinschi, Georges
openaire   +3 more sources