Results 111 to 120 of about 42,977 (261)

Synthesis of Pyrrole via a Silver-Catalyzed 1,3-Dipolar Cycloaddition/Oxidative Dehydrogenative Aromatization Tandem Reaction.

Journal of Organic Chemistry, 2017
Pyrroles are an important group of heterocyclic compounds with a wide range of interesting properties, which have resulted in numerous applications in a variety of fields.
Y. Liu, Huayou Hu, Xiang Wang, Sanjun Zhi, Y. Kan, Chao Wang   +5 more
semanticscholar   +1 more source

Amidine Syntheses from Classic to Contemporary for Medicinal Lead Compounds and Natural Products

European Journal of Organic Chemistry, EarlyView.
A revolution is underway in the synthesis of amidines with new methods unlocking complex, highly substituted amidines or closely related derivatives such as N‐sulfonyl amidines. This review surveys recent advances in amidines and related compounds, including methods to install them and bioactive molecules prominently featuring the amidine functionality.
Wyatt R. Swift‐Ramirez, Gregory A. Weiss   +1 more
wiley   +1 more source

Alkaloidszármazékok szintézise = Synthesis of alkaloid derivatives [PDF]

, 2009
a) Elsőként alkalmaztunk 3-nitrokromén-származékokat 2 pi komponensként azometin-ilidek 1,3-dipoláris cikloaddíciójában b) Új, egyedényes eljárást dolgoztunk ki hexahidro-pirrolo[2,1-a]izokinolinok előállítására c) Új azepin gyűrűt tartalmozó ...
Nyerges, Miklós, Pintér, Áron, Toke, László, Virányi, Andrea   +3 more
core  

One-step synthesis of differently bis-functionalized isoxazoles by cycloaddition of carbamoylnitrile oxide with β-keto esters [PDF]

, 2012
A new protocol for synthesizing different functionalized isoxazoles is provided. Carbamoylnitrile oxide generated from nitroisoxazolone underwent inverse electron-demand 1,3-dipolar cycloaddition with 1,3-dicarbonyl compounds in the presence of magnesium
975, 976, 977, 978, 979, 980, 981, 982, Ariga, Masahiro, Hirao, Shotaro, Ise, Yumiko, Kobiro, Kazuya, Nishiwaki, Nagatoshi, Nishizawa, Maho, Saigo, Kazuhiko, Sawayama, Jun   +15 more
core   +1 more source

Synthesis of 1,4-naphthoquinone derivatives using 1,3-dipolar cycloaddition and Sonogashira reactions

Orbital: The Electronic Journal of Chemistry, 2010
Naphthoquinones are known according to their important bio-activities, such as their antitumoral and topoisomerase inhibition properties. From 2-azido (3) or 2,3-diacetylene-1,4-naphthoquinone (4) it was possible to obtain triazole derivatives ...
Wilson Silva do Nascimento, Mauro Gomes da Silva, Ronaldo Nascimento de Oliveira, Celso Amorim Câmara   +3 more
doaj  

New Quinazolin-4(3H)-One Derivatives Incorporating Isoxazole Moiety as Antioxidant Agents: Synthesis, Structural Characterization, and Theoretical DFT Mechanistic Study

Pharmaceuticals
Background: This research centers on the development and spectroscopic characterization of new quinazolin-4(3H)-one-isoxazole derivatives (5a–e). The aim was to investigate the regioselectivity of the 1,3-dipolar cycloaddition involving arylnitriloxides ...
Yassine Rhazi, Riham Sghyar, Noemi Deak, Bouchra Es-Sounni, Bouchra Rossafi, Albert Soran, Mustapha Laghmari, Azize Arzine, Asmae Nakkabi, Khalil Hammani, Samir Chtita, Mohammed M. Alanazi, Gabriela Nemes, Mohamed El. Yazidi   +13 more
doaj   +1 more source

One-pot Microwave-Assisted Synthesis of 1H-Phenanthro[9,10- d][1,2,3]triazole

Molbank, 2008
In this study, a fast and good yield one-pot microwave-assisted synthesis (45 seconds) of 1H-phenanthro[9,10-d][1,2,3]triazole by a 1,3-dipolar cycloaddition reaction of sodium azide and 9-bromophenanthrene in the presence of potassium tert-butoxide in ...
Mehrak Faraji, Avat Arman Taherpour
doaj   +1 more source

1,3‐Diazetidin‐2‐Ones: Synthetic Approaches and Therapeutic Promise within the Aza‐β‐Lactam Family

European Journal of Organic Chemistry, EarlyView.
This review explores the synthesis, reactivity, and therapeutic potential of 1,3‐diazetidin‐2‐ones—an underexplored class of aza‐β‐lactams. Emphasis is placed on synthetic challenges, emerging methodologies, and their promise as β‐lactamase‐resistant scaffolds in medicinal chemistry. 1,3‐diazetidin‐2‐ones, overlooked members of the aza‐β‐lactam family,
Jozef Kristek, Jiří Pospíšil
wiley   +1 more source

Chalcones as versatile synthons for the synthesis of 5- and 6-membered nitrogen heterocylces [PDF]

, 2014
Chalcones belong to the flavonoid family which constitutes one of the major classes of naturally occurring oxygen heterocyclic compounds. The alpha,beta-unsaturated carbonyl system of chalcones possesses two electrophilic reactive centers allowing them ...
Albuquerque, Hélio, Cavaleiro, José, Santos, Clementina M.M., Silva, Artur   +3 more
core   +1 more source

Green and Sustainable Chemistry Approaches on Azide‐Based Click Reactions in Polymer Science

Macromolecular Rapid Communications, EarlyView.
Click Chemistry, particularly the azide‐alkyne cycloaddition (AAC) reaction, has revolutionized polymer chemistry, enabling precise and efficient synthesis of advanced functional materials. With its high regioselectivity, mild reaction conditions, and versatility, AAC reactions align closely with the principles of Green and Sustainable Chemistry.
Hatice Mutlu, Bercis Pektas, C. Remzi Becer, Azra Kocaarslan   +3 more
wiley   +1 more source