Results 151 to 160 of about 1,879 (233)

Synthesis of bis(dispiro[indolinone-pyrrolidine-imidazolones])

Russian Chemical Bulletin
V. Polyakov, E. V. Pervakova, N. Zyk, E. K. Beloglazkina   +3 more
semanticscholar   +2 more sources

Selective synthesis of spiro and dispiro compounds using Mn(III)-based oxidation of tetracarbonyl compounds [PDF]

Tetrahedron, 2020
The Mn(III)-based oxidation of methylenebis(cyclohexanedione)s and methylenebis(piperidinedione)s as a tetracarbonyl compound was investigated under various conditions, selectively producing spiro dihydrofurans and dispiro cyclopropanes depending on the ...
Satomi Nishikawa, Hiroshi Nishino
exaly   +1 more source

Synthesis and rearrangement of dispiro[3.1.3.2]-, dispiro[3.0.3.3]- and dispiro[3.0.4.2]undecanes- new entries to [3.3.3]propellanes

Tetrahedron, 1994
Abstract The dispiroketones 4–6 have been synthesized and rearranged by treatment with acids yielding the bicyclic enone 36 under kinetic control and the [3.3.3]propellane 37 under thermodynamic control. The corresponding alcohols 10–12 all yield the [3.3.3]propellane 41. The rearrangement of [7,7-D2]-12 to [8,8-D2]-41 proceeds stereospecifically and
Lutz Fitjer, Andrew Kanschik, Marita Majewski   +2 more
openaire   +1 more source

ChemInform Abstract: Syntheses of Dispiro[2.1.4.1]decane and Dispiro[2.0.3.3]decane.

ChemInform, 2001
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
John E. Baldwin, Maryann E. Keene, Rajesh Shukla   +2 more
openaire   +1 more source

Novel Dispiro Iminodioxolane Derivatives: Synthesis by Reaction of Isocyanides with Ninhydrin

Journal of Chemical Research, 2003
The reaction of isocyanides 1 with two equivalent of ninhydrin 2 gives C s symmetry dispiro iminodioxolanes 3 at refluxing conditions in chloroform in fairly high yields.
Ahmad Shaabani, Mohammad Bagher Teimouri, Hamid Reza Bijanzadeh   +2 more
exaly   +2 more sources

ChemInform Abstract: DISPIRO‐DITHIETANE

Chemischer Informationsdienst. Organische Chemie, 1970
AbstractDie Cycloalkanone (Ia)‐(Ie) reagieren bei Behandlung mit Formaldehyd in Gegenwart von Alkali zu den Tetra‐methylol‐Verbindungen (II), die zu (III) mesyliert wurden.
G. SEITZ, W. D. MIKULLA
openaire   +1 more source

Anti-inflammatory and anti-oxidant potential of Dispiro-indanedione hybrid of parthenin via regulating Nrf2 and NF-κB/MAPK pathways.

European Journal of Pharmacology
Steroidal and non-steroidal anti-inflammatory drugs are widely used for treating a spectrum of inflammatory conditions; however, their systemic adverse effects hinder their usage.
Diljeet Kumar, Manzoor Ahmed, Nusrit Iqbal Andrabi, C. Singh, Diksha Saroch, Yogesh P. Bharitkar, Gurleen Kour, Sreedhar Madishetti, Asha Bhagat, Sanket K. Shukla, Zabeer Ahmed   +10 more
semanticscholar   +1 more source

Phosphorus-nitrogen compounds: part 68. Synthesis, characterization, stereogenism, photophysical and bioactivity studies of novel unsymmetrical dispiro(N/N)cyclotriphosphazenes with carbazolyl and 4-chlorobenzyl pendant arms

New Journal of Chemistry, 2023
Organic-inorganic hybrid multi-heterocyclic unsymmetrical cis/trans dispirocyclotriphosphazenes with different pendant arms were obtained to investigate their spectral, stereogenic, photophysical and bioactivity properties. To prepare these phosphazenes,
Reşit Cemaloğlu, Nuran Asmafiliz, Z. Kılıç, Bünyemin Çoşut, B. Sabah, L. Açık, Nebahat Aytuna Çerçi, T. Hökelek   +7 more
semanticscholar   +1 more source

Synthesis and rearrangement of dispiro[2.0.3.4]-, dispiro-[3.0.3.3]- and dispiro[2.1.3.3]undecanes - preferred C4-C5 over C3-C4 and C4-C3 over C5-C6 rearrangements

Tetrahedron, 1994
Abstract The dispiranes 10–12 have been synthesized and rearranged by treatment with acids. With 10, an initial C3-C4 ring enlargement leads to [3.3.3]propellane 21, with 11, an initial C4-C3 ring contraction leads to pentalene 37, and with 12, an initial C4-C5 ring enlargement leads to 42, 43, 44 or 45, depending on the reagent used.
Lutz Fitjer, Beate Rissom, Andreas Kanschik, Ernst Egert   +3 more
openaire   +1 more source

Synthesis of Dispiro‐[indoline‐3,1'‐cyclopropane‐2',3''‐indoline]‐2,2''‐diones via Thermal [2+1] Cycloaddition Between 3‐Alkylidene‐7‐aza‐2‐indolones and 3‐Diazo‐7‐aza‐2‐oxindoles

Annalen der Pharmacie
Diastereoselective synthesis of highly substituted dispiro‐[indoline‐3,1'‐cyclopropane‐2',3''‐indoline]‐2,2''‐dione in excellent yield via an unusual catalyst‐free thermal [2+1]‐cycloaddition of E‐3‐alkylidene‐7‐aza‐2‐indolones and 3‐diazo‐7‐aza‐2 ...
Raman Kavitha Preethi, S. Kannadasan, Ponnusamy Shanmugam   +2 more
semanticscholar   +1 more source