Results 51 to 60 of about 17,991 (268)

Concise Synthesis of Tetrazole Macrocycle [PDF]

Organic Letters, 2017
A concise two step synthesis of tetrazole containing macrocycles from readily accessible starting materials is presented. The first step comprises a chemoselective amidation of amino acid derived isocyanocarboxylicacid esters with unprotected symmetrical diamines to afford diverse α-isocyano-ω-amines. In the second step, the α-isocyano-ω-amines undergo
Abdelraheem, Eman M. M.; de Haan, Michel P.; Patil, Pravin; Kurpiewska, Katarzyna; Kalinowska-Tluscik, Justyna; Shaabani, Shabnam; Domling, Alexander   +7 more
openaire   +5 more sources

A Crystallographic Study of a Novel Tetrazolyl-Substituted Nitronyl Nitroxide Radical

Crystals, 2018
Spin-labelled compounds are widely used in chemistry, physics, biology, and material sciences, but the directed synthesis of some functionalized organic radicals is still a challenge.
Vasily E. Romanov, Irina Yu. Bagryanskaya, Dmitry E. Gorbunov, Nina P. Gritsan, Elena V. Zaytseva, Dominique Luneau, Evgeny V. Tretyakov   +6 more
doaj   +1 more source

5-Aryl Tetrazoles from Direct C-H Arylation with Aryl Bromides.

Journal of Organic Chemistry, 2020
A mild direct C-H arylation of 1-substituted tetrazoles to 5-aryl tetrazoles is developed using a Pd/Cu co-catalytic system with readily available aryl bromides.
Yuan Zhang, J. C. Lee, M. Reese, B. Boscoe, J. Humphrey, Christopher J. Helal   +5 more
semanticscholar   +1 more source

Generation of Sulfonylated Tetrazoles through an Iron-Catalyzed Multicomponent Reaction Involving Sulfur Dioxide

iScience, 2020
Summary: As a privileged motif, tetrazoles can be widely found in pharmaceuticals and materials science. Herein, a five-component reaction of cycloketone oxime esters, alkynes, DABCO·(SO2)2, and two molecules of trimethylsilyl azide under iron catalysis ...
Jun Zhang, Xuefeng Wang, Yunyan Kuang, Jie Wu   +3 more
doaj  

Microwave alkylation of lithium tetrazolate [PDF]

Monatshefte für Chemie - Chemical Monthly, 2016
N1-substituted tetrazoles are interesting ligands in transition metal coordination chemistry, especially in the field of spin crossover. Their synthesis is performed in most cases according to the Franke-synthesis, using a primary amine as reagent introducing the substitution pattern.
Danny Müller, Christian Knoll, Peter Weinberger   +2 more
openaire   +3 more sources

Rapid microwave promoted heterocyclization of primary amines with triethyl orthoformate and sodium azide using zinc sulfide nanoparticles as recyclable catalyst

Green Chemistry Letters and Reviews, 2018
Microwave assisted synthesis of 1-substituted-1H-tetrazoles was developed using zinc sulfide nanoparticles as heterogeneous catalyst under solvent free conditions.
Hossein Naeimi, Fatemeh Kiani, Mohsen Moradian   +2 more
doaj   +1 more source

Photochemical Transformations of Tetrazole Derivatives: Applications in Organic Synthesis

Molecules, 2010
Tetrazoles remain a challenge to photochemists. Photolysis leads to cleavage of the tetrazolyl ring, may involve various photodegradation pathways and may produce a diversity of photoproducts, depending on the structure and conformational flexibility of ...
Luís Miguel Teodoro Frija, Amin Ismael, Maria Lurdes Santos Cristiano   +2 more
doaj   +1 more source

Synthesis and In Vitro Antiproliferative Activity of Novel Androst-5-ene Triazolyl and Tetrazolyl Derivatives

Molecules, 2011
A straightforward and reliable method for the regioselective synthesis of steroidal 1,4-disubstituted triazoles and 1,5-disubstituted tetrazoles via copper(I)-catalyzed cycloadditions is reported. Heterocycle moieties were efficiently introduced onto the
János Wölfling, Tibor Bartók, Éva Frank, Gyula Schneider, Judit Huber, István Zupkó, Dóra Kovács, Zalán Kádár   +7 more
doaj   +1 more source

Synthesis of 1-Substituted 1H-1,2,3,4-Tetrazoles Using Biosynthesized Ag/Sodium Borosilicate Nanocomposite

ACS Omega, 2019
An expedient solvent-free methodology has been developed to produce 1-substituted 1H-1,2,3,4-tetrazoles using sodium borosilicate glass-supported silver nanoparticles (Ag NPs) as a novel heterogeneous catalyst.
M. Nasrollahzadeh, Mohaddeseh Sajjadi, M. Tahsili, M. Shokouhimehr, R. Varma   +4 more
semanticscholar   +1 more source

Ruthenium‐Katalysierte ortho‐Arylierung von Benzoesäuren mit Arylthianthreniumsalzen

Angewandte Chemie, EarlyView.
Es wurde eine katalytische Ortho‐Arylierungsmethode entwickelt, mit der Arylthianthreniumsalze in Carboxylat‐funktionalisierte Biaryle umgewandelt werden können. Die Carboxylatgruppe kann in situ entfernt oder für eine weitere Derivatisierung verwendet werden.
Kaiping Wang, Xiaowen Teng, Duo Zhang, Bingxin Xu, Pan Gao, Shuli Wang, Shuwei Zhang, Lukas J. Gooßen, Feng Chen, Guodong Zhang   +9 more
wiley   +1 more source