Results 31 to 40 of about 9,597,280 (150)

[AcMIM]FeCl4: A Magnetically Separable Organocatalyst for the Clean Synthesis of Tetrahydrobenzo[b]pyran Derivatives

Current Organocatalysis, 2019
Background: Recently, organic synthesis using ionic liquids (ILs) via green approach has attracted considerable attention to address the problem associated with environmental pollution. Magnetization of ILs provides added advantages of separation by external magnet.
Arijit Saha, Soumen Payra, Archana Asatkar, Ashok Raj Patel, Subhash Banerjee   +4 more
openaire   +1 more source

Nitriles in heterocyclic synthesis: Novel syntheses of benzo[b]pyrans, naphtho[1,2-b]pyrans, naphtho[2,1-b]pyrans, pyrano[3,2-h]quinolines and pyrano[3,2-c]quinolines

, 1988
Benzo[b]pyrans, naphtho[1,2-b]pyrans, naphtho[2,1-b]pyrans, pyrano[3,2-h]quinolines, and pyrano[3,2-c]quinolines were synthesized by the reaction of cinnamonitriles with phenols, naphthols, 8-hydroxyquinoline, and 1-methyl-4-hydroxy-2-quinoline.
Mohamed H. Elnagdi, Abdel Ghani A. Elagamey, Fathy M. A. El-Taweel, Salah Z. Sawllim   +3 more
core   +1 more source

Synthesis of Bridged Tetrahydrobenzo[b]azepines and Derivatives through an Aza-Piancatelli Cyclization/Michael Addition Sequence

, 2020
International audienceHerein, we report the preparation of bridged tetrahydrobenzo[b]azepines, which was accomplished through an aza-Piancatelli cyclization/Michael addition sequence in a one-pot fashion from readily available precursors.
Sarazin, Yann, Carpentier, Jean-François, Lebœuf, David, Vincent Gandon, Lebceuf, David, Jean‐François Carpentier, Guillot, Régis, Yann Sarazin, Régis Guillot, Shengdong Wang, David Lebœuf, Gandon, Vincent, Bour, Christophe, Wang, Shengdong, Christophe Bour   +14 more
core   +1 more source

An efficient protocol for synthesis of tetrahydrobenzo[b]pyrans using amino functionalized ionic liquid

Comptes Rendus. Chimie, 2011
A new functionalized basic ionic liquid, 4-amino-1-(2,3-dihydroxy propyl) pyridinium hydroxide [ADPPY] [OH], has been introduced as a catalyst for the synthesis of tetrahydrobenzo[ b ]pyrans under mild conditions.
P.P. Salvi, A.M. Mandhare, A.S. Sartape, D.K. Pawar, S.H. Han, S.S. Kolekar   +5 more
openaire   +1 more source

Synthesis and photochromic properties of substituted 3H-naphtho [2,1-b] pyrans

, 2004
The synthesis and spectroscopic properties of novel 3H-naphtho[2, 1-b]pyrans are described. Subtle variation of the colour of the photo-generated merocyanine dyes derived from these naphthopyrans can be accomplished by controlling the steric interactions
Hursthouse, Michael B., Christopher D. Gabbutt, Gabbutt, Christopher D., B. Mark Heron, Peter N. Horton, Heron, B. Mark, Alicia C. Instone, Michael B. Hursthouse, Horton, Peter N., Instone, Alicia C.   +9 more
core   +1 more source

Polyaniline/SiO2 Catalyzed One-pot Synthesis of Tetrahydrobenzo[b]pyran Derivatives

South African Journal of Chemistry, 2010
Polyaniline/SiO2 is an efficient catalyst for the synthesis of tetrahydrobenzo[b]pyran derivatives from a one-pot, three component, condensation of aldehydes, malononitrile and dimedone at room temperature. This protocol has several advantages such as high yield, a simple work up procedure, low toxicity and easy recovery and reusability of the ...
Yelwande, Ajeet A., Arbad, Balasaheb R., Lande, Machhindra K.   +2 more
openaire   +2 more sources

An efficient three-step synthesis of cyclopenta[b]pyrans via 2-donor-substituted Fischer ethenylcarbenechromium complexes

, 2005
A wide range of cyclopenta[b]pyrans 4 has been synthesized in a one-pot reaction by treatment of different 2-donorsubstituted ethenylcarbene-chromium complexes 2 with alkynes in THF in moderate to excellent yields (41-90% for 14 out of 25 examples).
Funke, Frank, Belgardt, T., Schimer, H., de Meijere, Armin, Noltemeyer, M., Stein, F., Duetsch, Michael, Wu, Y., Knieriem, B.   +8 more
core   +1 more source

Synthesis of novel tetrazole tetrahydrobenzo[b]thiophene via Ugi-MCR: As new antileishmanial prototype

, 2021
A new series of tetrazole series of tetrazole tetrahydrobenzo[b]thiophene (10a-l) were synthesized and evaluated as antileishmanial activity and cytotoxicity of in vitro.
Girdhar Pal Singh, Sultan Pathan
core   +1 more source

Facile One-Pot Synthesis of Photochromic Pyrans

, 2016
Photochromic pyrans, including [3H]naphtho[2,1-b]pyrans, [2H]naphtho[1,2-b]pyrans, indeno-fused naphtho[1,2-b]pyrans, and heteroannulated pyrans, were synthesized in excellent yields through a facile one-pot procedure by reaction of propargyl alcohol and
Weili Zhao (1694086), Erick M. Carreira (1330920)   +1 more
core   +1 more source

Sulfonic acid–functionalized magnetic Fe_3-xTi_xO₄ nanoparticles: New recyclable heterogeneous catalyst for one-pot synthesis of tetrahydrobenzo[b]pyrans and dihydropyrano[2,3-c]pyrazole derivatives

, 2016
In this work, titanomagnetite nanoparticles (Fe3-xTixO4) have been used as a novel suppport for the synthesis of a magnetic acidic catalyst. These nanoparticles were functionalized with sulfonic acid groups to prepare the Fe3-xTixO4@SO3H nanoparticles ...
Younes Abbasi (2590291), Davood Azarifar (806994)   +1 more
core   +1 more source