Results 21 to 30 of about 1,712,028 (279)

Synthesis of Spiro Heterocyclic Compounds

E-Journal of Chemistry, 2010
Reaction of isatin with acetophenone derivatives gave 3-hydroxy-3-phenacyl oxindole derivatives (II), dehydration of (II) gave 3-phenacylidene-2-indolinone derivatives (III).
Mohamed N. Ibrahim, Mohamed F. El-Messmary, Mohamed G. A. Elarfi   +2 more
doaj   +1 more source

Novel Rearrangements in the Reactions Directed Toward Preparation of Spiro-N,N-ketals: Reactions of Naphthalene-1,8-diamine with Ninhydrin and Isatin

Molecules, 2012
Spiro-N,N-ketal 5, consisting of a phthaloperine heterocyclic ring and a naphtha[1,8-ef][1,4]diazepine ring, was obtained along with spiro-N,N-ketal 2 via 2,2-condensation in the reaction of ninhydrin with naphthalene-1,8-diamine.
Keiji Kobayashi, Junko Kimura, Reiko Aoyama, Hideyuki Seto, Motoko Akita   +4 more
doaj   +1 more source

Bis-Spiro-Oxetane and Bis-Spiro-Tetrahydrofuran Pyrroline Nitroxide Radicals: Synthesis and Electron Spin Relaxation Studies

, 2021
Synthesis of bis-spiro-oxetane and bis-spiro-tetrahydrofuran pyrroline nitroxide radicals relies on the Mitsunobu reaction-mediated double cyclizations of N-Boc protected pyrroline tetraols.
Andrzej Rajca (1339899), Andrzej Rajca, Thacien Ngendahimana, Suchada Rajca, Sandra S. Eaton (1286709), Maren Pink, Sandra S. Eaton, Maren Pink (1340589), Shengdian Huang (1534051), Suchada Rajca (1339911), Thacien Ngendahimana (6265052), Shengdian Huang, Gareth R. Eaton (1286700), Gareth R. Eaton   +13 more
core   +1 more source

Photochromism of naphthoxazine-spiro-indolines [PDF]

, 1995
Naphthoxazine-spiro-indolines (NOSIs) can exist in a colourless and a coloured form. These compounds can interconvert between these two forms either photochemically or thermally and are resilient to degradation even after repeated cycles of colouration ...
Jonathan Hobley (2129365)
core   +3 more sources

The tert-Amino Effect in Heterocyclic Chemistry. Synthesis of Spiro Heterocycles

Molecules, 2005
The tert-amino reaction effect was examined. A new method to synthesize spiro heterocycles is presented. It was shown that the “tert-amino effect” could be applied to the formation of spiro-fused heterocycles.
Y. Morzherin, O. Eltsov, L. Dyudya, T. Glukhareva, E. D’yachenko   +4 more
doaj   +1 more source

Asymmetric Fluorinated Spiro Hole‐Transport Materials Enabled by a Rapid Core‐Forming Strategy for Blade‐Coated Perovskite Solar Cells [PDF]

Advanced science
Facile synthesis of asymmetric fluorinated spiro‐type HTMs combined with blade‐coating fabrication and vacuum‐assisted crystallization enables high‐efficiency PSCs with PCEs of 24.49% (0.09 cm2) and 23.28% (1.00 cm2), along with excellent stability.
Lee K, Lin X, Chang Y, Tsai C, Chu P, Chen Y, Chiu W, Lin Y, Li S, Hsieh H, Liau K, Lu S, Wang C, Lin Y.   +13 more
europepmc   +2 more sources

Spiro-Lactams as Novel Antimicrobial Agents

, 2020
Introduction: Structural modulation of previously identified lead spiro-β-lactams with antimicrobial activity was carried out. Objective: The main objective of this work was to synthesize and evaluate the biological activity of novel spiro-lactams ...
Bártolo, Inês, Fontinha, Diana, Esteves, Margarida I. M., Melo, Teresa M. V. D. Pinho e, Soares, Maria I. L., Caratão, Cátia C., Alves, Nuno G., Alves, Américo J. S., Lopes, Susana M. M., Prudêncio, Miguel, Taveira, Nuno, G. Alves, Nuno, Alves, Américo, Esteves, Margarida, Caratão, Cátia   +14 more
core   +1 more source

Simple approach to thieno[3,2-d]pyrimidines as new scaffolds of antimicrobial activities

Acta Pharmaceutica, 2016
6ʹ-(4-Chlorophenyl)-spiro[cyclohexane-1,2ʹ-thieno[3,2-d][1,3] oxazin]-4ʹ(1ʹH)-one (1) was synthesized and used as a starting material for the synthesis of a novel series of spiro compounds having biologically active sulfonamide 2a-e and 3ʹ-(4 ...
Hafez Hend N., El-Gazzar Abdel-Rhman B. A., Zaki Magdi E. A.   +2 more
doaj   +1 more source

Synthesis and evaluation of the antioxidant activity of new spiro-1,2,4-triazine derivatives applying Ag/Fe3O4/CdO@MWCNT MNCs as efficient organometallic nanocatalysts

Frontiers in Chemistry, 2022
We applied the Petasites hybridus rhizome water extract as green media so that Ag/Fe3O4/CdO@ multi-walled carbon nanotubes magnetic nanocomposites (Ag/Fe3O4/CdO@MWCNTs MNCs) could be prepared.
Elham Ezzatzadeh, Somayeh Soleimani-Amiri, Zinatossadat Hossaini, Khatereh Khandan Barani   +3 more
doaj   +1 more source

Desing, synthesis and anti-inflammatory activity of dirivatives 10-R-3-aryl-6,7-dihydro-2H-[1,2,4]triazino[2,3-c]quinazolin-2-ones of spiro-fused cyclic frameworks

Acta Chimica Slovenica, 2017
Present work is devoted to the purposeful search of novel promising anti-inflammatory agents among the insufficiently known 3'-R-10'-R1-spiro[hetaryl-3(4),6'-[1,2,4]triazino[2,3-c]quinazolin]-2'(7'H)-ones.
Oleksandra Kolomoets, Oleksii Voskoboynik, Oleksii Antypenko, Galyna Berest, Inna Nosulenko, Vitaliy Palchikov, Olexandr Karpenko, Sergiy Kovalenko   +7 more
doaj   +1 more source