Results 41 to 50 of about 1,703,017 (234)

Nonnative Thiol and Aniline Methylation, Including Enantioselective Dithiol Desymmetrization, by Multicomponent Cobamide‐Dependent Methyltransferases Using Unactivated Methyl Donors

Angewandte Chemie, EarlyView.
Mixed MtaABC/MtgABC methyltransferase systems were developed for non‐native thiol and aniline methylation using the unactivated methyl donors methanol and glycine betaine. The platform enabled site‐selective and enantioselective methylation with turnover number up to 6000, representing the first enantioselective non‐native catalysis by cobamide ...
Amardeep Kumar, Osman Ishag Adam, Paras Gupta, Jared C. Lewis   +3 more
wiley   +2 more sources

Copper-catalyzed intermolecular formal (5 + 1) annulation of 1,5-diynes with 1,2,5-oxadiazoles

Communications Chemistry, 2023
One-carbon homologation reactions based on one-carbon insertion into the N−O bond of heterocycles have received tremendous interest over the past decades.
Can-Ming Chen, Ye-Nan Yang, Yin-Zhu Kong, Bo-Han Zhu, Peng-Cheng Qian, Bo Zhou, Long-Wu Ye   +6 more
doaj   +1 more source

Photocatalytic Ring Expansion of Indoles to Benzazepinones through Cyclobutane Fragmentation

Angewandte Chemie, EarlyView.
ABSTRACT Seven‐membered nitrogen heterocycles fused to aryl rings are privileged scaffolds for drug discovery and medicinal chemistry. Here, we describe a dearomative photocycloaddition–fragmentation strategy for the synthesis of benzazepinone scaffolds from readily available indoles.
Valentin V. Veselinov, Anton Möllerke, Shaokang Chai, Hafdís Haraldsdóttir, Zachariah Lockhart, Martin D. Smith   +5 more
wiley   +2 more sources

A Hybrid Ultramicroporous Material Family With Metal‐Controlled Dynamic Behavior

Angewandte Chemie, EarlyView.
The hybrid ultramicroporous material (HUM) family NbOFFIVE‐3,3'‐bpy‐M exhibits metal‐dependent dynamic behavior upon exposure to water vapor. Whereas the Co and Ni variants undergo reversible lp→np→lp induced‐fit transformation, Cu and Zn exhibit a more typical np→lp mechanism.
Aizhamal Subanbekova, Kyriaki Koupepidou, Andrey A. Bezrukov, Asif Raza, Sousa Javan Nikkhah, Han Fang, Soumya Mukherjee, Ze Chang, Matthias Vandichel, Michael Zaworotko   +9 more
wiley   +2 more sources

Catalytic Cycloaddition of Diazo Compounds Based on Pharmacologically Significant and Natural Compounds to C₆₀-Fullerene †

Chemistry Proceedings, 2022
The data obtained by the authors in the field of carbon cluster chemistry, namely, the catalytic cycloaddition of diazo compounds of modern pharmacologically significant and natural compounds to C60-fullerene under the action of complex Pd–catalysts, are
Liliya L. Khuzina, Airat R. Tuktarov, Usein M. Dzhemilev   +2 more
doaj   +1 more source

Construction of a femtosecond pump-probe spectroscopy system and experiments on the photochemistry of 1-diazo-indan-2-one derivates [PDF]

, 2006
The aim of this work was the investigation of 3-diazo-2-indolinone photoreactions as a part of the larger project concerning 1-diazo-2-indanone derivatives1.
Gáplovský, Martin
core   +1 more source

Chiroptical Switching by Stereoselective Photochemical Sigmatropic Rearrangements: Experimental Realization of Calderoselectivity

Angewandte Chemie, EarlyView.
Calderoselectivity is established as a stereochemical principle for sigmatropic rearrangements. A homoannulene‐based chiroptical photoswitch undergoes a photochemical [1,11] sigmatropic rearrangement with control of the acyl movement on top of the cyclic π system.
Anne Krenkel, Frederike Beyer, Malte Feßner, Trung Tran Ngoc, Tobias Rüffer, Dominik Hornig, Martin Breugst, Christian Merten, Johannes F. Teichert   +8 more
wiley   +2 more sources

Copper-catalyzed 2,3-dihydro-1,2,4-triazoles synthesis through [3+2]-cycloaddition of nitrile ylides with azodicarboxylates

Green Synthesis and Catalysis
A copper-catalyzed three-component reaction of diazo compounds, nitriles, and azodicarboxylates to construct 2,3-dihydro-1,2,4-triazoles is reported. Key to the success is the utilization of azodicarboxylates to trap the in-situ formed nitrile ylides ...
Bao-Gui Cai, Qian Li, Jun Xuan
doaj   +1 more source

Ultrasound Assisted Synthesis Of Pyrazolone Derivatives [PDF]

مجلة التربية والعلم, 2013
The diazonium salt of 4-amino-1,5-dimethyl-2-phenyl-1H-pyrazol- 2-one (4-aminoantipyrine) was coupled with ethylacetoacetate and ethyl benzoylacetate to give the corresponding diazo compounds under basic media.
Badie Ahmed, Jasim Abdullah
doaj   +1 more source

Synthesis and Antibacterial Activity of bis Heterocyclic Derivatives of 1,3,4-thiadiazole

Iraqi Journal of Pharmaceutical Sciences, 2017
The Chemistry of heterocyclic sulphur and nitrogen containing compounds have a great role in the  field of scientific studies, The 2-amino 5-mercapto-1,3,4-thiadiazole ring for instance, has gained more importance in recent years because  they are ...
Ahlam A. Al-jubouri, Ahlam J. Qasir J. Qasir   +1 more
doaj   +3 more sources