Results 31 to 40 of about 3,016,957 (322)

Organocatalytic Synthesis of Spiro-Bridged Heterocyclic Compounds via a Chemoselective Vinylogous Michael/Cyclization/Rearrangement Sequence. [PDF]

J Org Chem
Chen IT, Lin H, Han JL.
europepmc   +2 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

Spiro heterocyclic compounds. V. Synthesis of spiro(homophthalimide-4,4'-(4'H-pyran)) compounds. [PDF]

Chemical and Pharmaceutical Bulletin, 1982
AbstractAus dem Phthalonimid (I) wird in einer Knoevenagel‐ Kondensation mit Malononitril (II) das Derivat (III) hergestellt, das mit einigen Methylen‐aktiven Verbindungen (IV) zu den Spiroverbindungen (V) reagiert.
Hirotaka Otomasu, Teruhisa Fujimaki
openaire   +3 more sources

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

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

Multiple photoluminescence of spiro[acridine-fluorene]-based o-carboranyl compounds with potential as a visual sensory material

Journal of Materials Chemistry C, 2020
Two spiro[acridine-9,9′-fluorene]-based closo-o-carboranyl compounds were prepared and they demonstrated the application potential of π-aromatic conjugated o-carboranyl compounds as visual sensory materials.
M. Mun, C. Ryu, Hyunhee So, Mingi Kim, Ji Hye Lee, Hyonseok Hwang, K. Lee   +6 more
semanticscholar   +1 more source

Microbial Transformation of neo-Clerodane Diterpenoid, Scutebarbatine F, by Streptomyces sp. CPCC 205437

Frontiers in Microbiology, 2021
Biotransformation of the neo-clerodane diterpene, scutebarbatine F (1), by Streptomyces sp. CPCC 205437 was investigated for the first time, which led to the isolation of nine new metabolites, scutebarbatine F1–F9 (2–10). Their structures were determined
Dewu Zhang, Xiaoyu Tao, Guowei Gu, Yujia Wang, Wenxia Zhao, Wuli Zhao, Yan Ren, Shengjun Dai, Liyan Yu   +8 more
doaj   +1 more source

1,6-Conjugate-Addition-Induced [2 + 1] Annulation of para-Quinone Methides and Pyrazolones: Synthesis of Bis-Spiro Compounds with Contiguous Quaternary Spiro-Centers.

Organic Letters, 2019
A diastereoselective formal 1,6-conjugate-addition-mediated [2 + 1] annulation reaction using p-quinone methides and pyrazolones has been described. The corresponding bis-spiro[cyclohexadienone-cyclopropane-pyrazolone] compounds were obtained in very ...
S. B. Kale, Popat K. Jori, Thanusha Thatikonda, R. Gonnade, U. Das   +4 more
semanticscholar   +1 more source

One-Pot Synthesis of Spiro-isobenzofuran Compounds via the Sequential Condensation/Oxidation Reaction of Ninhydrin with 4-Amino-1,2-naphthoquinones/2-Amino-1,4-naphthoquinones under Mild Conditions

ACS Omega, 2020
A one-pot route for the synthesis of spiro-isobenzofuran compounds was developed via the condensation reaction of ninhydrin with 4-amino-1,2-naphthoquinones or 2-amino-1,4-naphthoquinones in acetic acid followed by the oxidative cleavage of the ...
S. H. Mousavi, M. Mohammadizadeh, Z. Roshan, Azar Jamaleddini, S. Arimitsu   +4 more
semanticscholar   +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