Results 91 to 100 of about 209 (110)
Some of the next articles are maybe not open access.
Application of mesoporous silicate-magnetic compounds in the synthesis of tetrahydrobenzo[b]pyran
Chemistry and Nanochemistry,4(4 ...Karami, Masoomeh, Sanaeishoar, Haleh
openaire +1 more source
Microwave Assisted, L-Tyrosine Catalyzed Efficient Synthesis of Tetrahydrobenzo[b] Pyrans
2018A mild and efficient protocol has been developed for the synthesis of Tetrahydrobenzo[b]pyrans, from aldehyde, malononitrile and dimedone in presence of L-Tyrosine under Microwave irradiation. High yield, simple workup procedure and mild reaction condition are main feature of this protocol.
Rupnar, Balaji D. +3 more
openaire +1 more source
ChemInform, 2011
AbstractThe reaction of dimedone (Ia) with aldehydes (V) and malononitrile in the presence of equimolar amount of NH4OAc yields unexpected tetrahydrobenzopyrans instead of quinolines.
Kedar A. Undale +4 more
openaire +1 more source
AbstractThe reaction of dimedone (Ia) with aldehydes (V) and malononitrile in the presence of equimolar amount of NH4OAc yields unexpected tetrahydrobenzopyrans instead of quinolines.
Kedar A. Undale +4 more
openaire +1 more source
Research on Chemical Intermediates, 2017
We report here a new magnetically recyclable catalyst consisting of iron-substituted Keggin-type heteropolyacid (HPA) grafted on modified Fe3O4 nanoparticles. The synthesized hybrid nanomaterial exhibited the excellent catalytic efficiency in condensation reaction for the preparation of tetrahydrobenzo[b]pyrans under solvent-free conditions as well as ...
Hamid Reza Saadati-Moshtaghin +1 more
openaire +1 more source
We report here a new magnetically recyclable catalyst consisting of iron-substituted Keggin-type heteropolyacid (HPA) grafted on modified Fe3O4 nanoparticles. The synthesized hybrid nanomaterial exhibited the excellent catalytic efficiency in condensation reaction for the preparation of tetrahydrobenzo[b]pyrans under solvent-free conditions as well as ...
Hamid Reza Saadati-Moshtaghin +1 more
openaire +1 more source
Mendeleev Communications, 2011
Triethylenetetraammonium trifluoroacetate-catalyzed condensation of benzaldehydes, malononitrile and cyclic 1,3-dioxo compounds in aqueous medium affords the corresponding fused 2-amino-4-aryl-3-cyanopyrans.
Jia Zheng, Yiqun Li
openaire +1 more source
Triethylenetetraammonium trifluoroacetate-catalyzed condensation of benzaldehydes, malononitrile and cyclic 1,3-dioxo compounds in aqueous medium affords the corresponding fused 2-amino-4-aryl-3-cyanopyrans.
Jia Zheng, Yiqun Li
openaire +1 more source
ChemInform, 2016
AbstractTitle compounds are efficiently synthesized through a one‐pot, three‐component Knoevenagel—Michael—Thorpe—Ziegler cyclization sequence catalyzed by N,N‐dimethylbenzylamine.
Hamzeh Kiyani, Mozhgan Sadat Jalali
openaire +1 more source
AbstractTitle compounds are efficiently synthesized through a one‐pot, three‐component Knoevenagel—Michael—Thorpe—Ziegler cyclization sequence catalyzed by N,N‐dimethylbenzylamine.
Hamzeh Kiyani, Mozhgan Sadat Jalali
openaire +1 more source
Polyaniline/SiO2 Catalyzed One-pot Synthesis of Tetrahydrobenzo[b]pyran Derivatives
2010Polyaniline/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. +2 more
openaire +2 more sources
Inorganic and Nano-Metal Chemistry, 2016
ABSTRACTThe efforts to use green catalysts for organic synthesis are undeniable. Natural catalysts are biodegradable and easy to access. Herein, glutamic acid was applied as a natural and green catalyst for the synthesis of tetrahydrobenzo[b]pyran and 3,4-dihydropyrimidinone derivatives under solvent-free and thermal conditions.
Khatereh Khandan-Barani +3 more
openaire +1 more source
ABSTRACTThe efforts to use green catalysts for organic synthesis are undeniable. Natural catalysts are biodegradable and easy to access. Herein, glutamic acid was applied as a natural and green catalyst for the synthesis of tetrahydrobenzo[b]pyran and 3,4-dihydropyrimidinone derivatives under solvent-free and thermal conditions.
Khatereh Khandan-Barani +3 more
openaire +1 more source
Catalysis Letters, 2009
An efficient, rapid, one-pot synthesis of tetrahydrobenzo[b]pyran is achieved via a three-component reaction of aldehydes, 1,3-diketone, malononitrile in 20% ethanol using anhydrous potassium phosphate as a catalyst at room temperature. The key advantages are the short reaction time, high yields, simple work-up, inexpensive catalyst and purification of
D. M. Pore +3 more
openaire +1 more source
An efficient, rapid, one-pot synthesis of tetrahydrobenzo[b]pyran is achieved via a three-component reaction of aldehydes, 1,3-diketone, malononitrile in 20% ethanol using anhydrous potassium phosphate as a catalyst at room temperature. The key advantages are the short reaction time, high yields, simple work-up, inexpensive catalyst and purification of
D. M. Pore +3 more
openaire +1 more source
Three-Component Synthesis of Tetrahydrobenzo[b]pyrans Catalyzed by Sodium Cyclamate
HETEROCYCLES, 2022Hamzeh Kiyani, Fatemeh Baghaie
openaire +1 more source