Results 21 to 30 of about 2,558 (239)
Expedient Organocatalytic Syntheses of 4-Substituted Pyrazolidines and Isoxazolidines
Molecules, 2016 The efficient organocatalytic synthesis of heterocyclic systems of biological relevance is a subject of growing interest. We have found that the pyrrolidine/benzoic acid-catalyzed reaction of α-substituted propenals such as methacrolein, 2-benzylpropenal
Tarek Yousfi +4 more
doaj +1 more source
ON THE OXALATES OF HYDRAZINE. [PDF]
Journal of the American Chemical Society, 1910 n ...
openaire +1 more source
Results in Chemistry, 2021 An efficient tetra-n-butyl ammonium peroxydisulphate (TBA)2S2O8 catalyzed a direct one-pot synthesis of fully substituted pyrazoles in excellent yields with high regioselectivity has been described via a three-component cyclocondensation of aldehydes ...
Mallesh Magini +5 more
doaj +1 more source
1,1,2,2-Tetrakis[(benzoylamino)methyl]hydrazine
Molbank, 2011 We report herein the synthesis of 1,1,2,2-tetrakis[(benzoylamino)methyl]-hydrazine from (benzamidomethyl)triethylammonium chloride and hydrazine monohydrate in the presence of triethylamine in ethanol/aqueous media. The structure of the newly synthesized
Emil Popovski +2 more
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One-pot preparation of carbamoyl benzotriazoles and their applications in the preparation of ureas, hydrazinecarboxamides and carbamic esters [PDF]
Journal of the Serbian Chemical Society, 2016 Carbamoyl benzotriazoles were conveniently synthesized in one-pot from carboxylic acids, diphenylphosphorazidate (DPPA) and benzotriazole (BtH). The reactivity and applications of carbamoyl benzotriazoles were also explored.
Mao Hui +5 more
doaj +1 more source
Pd-Catalyzed Regioselective Allylation of Mono- and Disubstituted Hydrazines
, 2016 Palladium-catalyzed allylation of hydrazines using allyl alcohols is reported. This highly efficient protocol furnishes monoallylated hydrazines selectively, in 27–99% yields.
Uno Mäeorg (1859527) +1 more
core +1 more source
Nature CommunicationsWe report the highly enantioselective Cu-catalyzed asymmetric propargylic substitution (APS) of α-tertiary propargylic electrophiles using hydrazines and hydroxylamines as a fruitful strategy to access multifunctional α-tertiary hydrazines or ...
Yi Gong +10 more
doaj +1 more source
Approaches towards the synthesis of 5-aminopyrazoles
Beilstein Journal of Organic Chemistry, 2011 The biological and medicinal properties of 5-aminopyrazoles have prompted enormous research aimed at developing synthetic routes to these heterocyles. This review focuses on the biological properties associated with this system. Various synthetic methods
Ranjana Aggarwal +3 more
doaj +1 more source
Synthesis of aza-phenylalanine, aza-tyrosine, and aza-tryptophan precursors via hydrazine alkylation; pp. 168–178 [PDF]
Proceedings of the Estonian Academy of Sciences, 2015 Aza-amino acid precursors with an aromatic side chain were synthesized using hydrazine alkylation. This synthetic pathway avoided use of hydrogen gas and expensive hydrogenation catalysts. For the optimization of this alkylation reaction various solvents
Anton Mastitski +3 more
doaj +1 more source
Intermolecular Alkyne Hydroaminations Involving 1,1-Disubstituted Hydrazines
, 2016 Two readily prepared catalysts have been developed for the hydroamination of alkynes by 1,1-disubstituted hydrazines. The catalyses are facile with terminal alkynes and some internal alkynes.
Aaron L. Odom (1482148) +2 more
core +1 more source