Results 101 to 110 of about 25,619 (230)

Enantioselective Cycloaddition Reactions Catalyzed by BINOL-Derived Phosphoric Acids and N-Triflyl Phosphoramides: Recent Advances

Molecules, 2015
Over the last several years there has been a huge increase in the development and applications of new efficient organocatalysts for enantioselective pericyclic reactions, which represent one of the most powerful types of organic transformations.
Felix E. Held, Dominik Grau, Svetlana B. Tsogoeva   +2 more
doaj   +1 more source

Green ultrasound-assisted three-component click synthesis of novel 1H-1,2,3-triazole carrying benzothiazoles and fluorinated-1,2,4-triazole conjugates and their antimicrobial evaluation

Acta Pharmaceutica, 2017
The present study describes an efficient and ecofriendly, ultrasound, one-pot click cycloaddition approach for the construction of a novel series of 1,4-disubstituted-1,2,3-triazoles tethered with fluorinated 1,2,4-triazole-benzothiazole molecular ...
Rezki Nadjet, Aouad Mohamed Reda
doaj   +1 more source

A Novel One-Pot Green Synthesis of Dispirooxindolo-pyrrolidines via 1,3-Dipolar Cycloaddition Reactions of Azomethine Ylides

Molecules, 2015
A facile synthesis of dispirooxindolopyrrolidines has been accomplished via a one-pot three component 1,3-dipolar cycloaddition reaction. The reaction of azomethine ylides generated in situ from L-phenylalanine and substituted isatins with a series of ...
Abdulrahman I. Almansour, Natarajan Arumugam, Raju Suresh Kumar, Govindasami Periyasami, Hazem A. Ghabbour, Hoong-Kun Fun   +5 more
doaj   +1 more source

One-flask synthesis of 1,3,5-trisubstituted 1,2,4- triazoles from nitriles and hydrazonoyl chlorides via 1,3-dipolar cycloaddition [PDF]

, 2014
[[abstract]]A new “one-flask” synthesis of 3,5-disubstituted 1,2,4-triazoles has successfully been developed to synthesize a series of 3,5-disubstituted 1,2,4-triazoles.
Wang, Li-Ya;Wang, Li-Ya;蔡建鈞;Tsai, Henry J;Lin, Hui-Yi;Lin, Hui-Yi;Ka, Kimiyoshi;Kaneko, Kimiyoshi;Che, Fen-Ying;Cheng, Fen-Ying;Sh, Hsin-Siao;Shih, Hsin-Siao;Won, Fung Fuh;Wong, Fung Fuh;Hu, Jiann-Jyh;Huang, Jiann-Jyh
core  

Synthesis and In Silico Analysis of New Polyheterocyclic Molecules Derived from [1,4]-Benzoxazin-3-one and Their Inhibitory Effect against Pancreatic α-Amylase and Intestinal α-Glucosidase

Molecules
This study focuses on synthesizing a new series of isoxazolinyl-1,2,3-triazolyl-[1,4]-benzoxazin-3-one derivatives 5a–5o. The synthesis method involves a double 1,3-dipolar cycloaddition reaction following a “click chemistry” approach, starting from the ...
Mohamed Ellouz, Aziz Ihammi, Abdellah Baraich, Ayoub Farihi, Darifa Addichi, Saliha Loughmari, Nada Kheira Sebbar, Mohamed Bouhrim, Ramzi A. Mothana, Omar M. Noman, Bruno Eto, Fatiha Chigr, Mohammed Chigr   +12 more
doaj   +1 more source

Reaction of Nitrilimines with Pyruvaldehyde Hydrazones: Synthesis and Antimicrobial Evaluation of Some New 1,2,4-Triazole Derivatives

Journal of Chemistry, 2015
A new series of 1,3,4,5,5-pentasubstituted-1,2,4-triazoles (4a–j, 6a–j) have been synthesized by the 1,3-dipolar cycloaddition of suitable nitrilimines 2 to pyruvaldehyde (2-oxopropanal) hydrazones having (COPh, COOMe, COOEt, Me/Me, and Me/Ph) groups 3 ...
Hany M. Dalloul
doaj   +1 more source

Cycloaddition Reactions of C,N-Diphenylnitrone to Methylene-γ-butyrolactones

Molecules, 2000
Cycloaddition of C,N-diphenylnitrone to α-methylene-γ-butyrolactone afforded two diastereomeric 5-spirosubstituted isoxazolidines with high selectivity.
Andrea Goti, Cristina Faggi, Franca M. Cordero, Martina Cacciarini   +3 more
doaj   +1 more source

Studies on Heterocyclic Compounds. XIV. 1, 3-Dipolar Cycloaddition Reaction of Dimethyl Acetylenedicarboxylate with Phenylhydrazones

Chemical and Pharmaceutical Bulletin, 1973
1, 3-Dipolar cycloaddition of aldehyde hydrazones with dimethyl acetylenedicarboxylate without solvent gives rise to dimethyl 1, 3-diphenylpyrazole-4, 5-dicarboxylate, and in some cases trimethyl 1-phenylpyrazole-3, 4, 5-tricarboxylate as a by-product.
OGURA, HARUO, KUBO, KAZUO, WATANABE, YUMIKO, ITOH, TSUNEO   +3 more
openaire   +2 more sources

Aspects of the chemistry of some highly crowded aromatic ligands [PDF]

, 1990
A series of ortho-substituted arylchlorophosphoranes has been prepared. The structures of these compounds have been studied by the use of (^31)Cl n.q.r. and solid-state (^31)P n.m.r. . It has been shown that ortho substitution by groups such as CH(_3) or
Straw, T. A.
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3-Functional substituted 4-trifluoromethyl tetrahydrothiophenes via [3 + 2]-cycloaddition reactions [PDF]

, 2019
New 4-(trifluoromethyl)tetrahydrothiophenes containing an ester, sulfone, sulfoximine, sulfonamide, or phosphonate moiety at position 3 were synthesized by 1,3-dipolar [3 + 2]-cycloaddition reactions of 3,3,3-trifluoropropene derivatives and thiocarbonyl
Yuriy G. Shermolovich (2528338), Yuriy M. Markitanov (7524416), Tymofii V. Rudenko (6884834), Eduard B. Rusanov (1446721), Vadim M. Timoshenko (2528335)   +4 more
core   +1 more source