نتایج جستجو برای: aza- Michael

تعداد نتایج: 28859  

Silica ferric hydrogensulfate is an efficient heterogeneous catalyst for the cyclization of 2- aminochalcones to the corresponding 2,3-dihydroquinolin- 4(1H)-ones. This intramolecular aza Michael reaction was carried out in high yields using chalcones bearing of electron donating and electron withdrawing groups. The catalyst is reusable without significant decreases in its activity after four t...

Silica ferric hydrogensulfate is an efficient heterogeneous catalyst for the cyclization of 2- aminochalcones to the corresponding 2,3-dihydroquinolin- 4(1H)-ones. This intramolecular aza Michael reaction was carried out in high yields using chalcones bearing of electron donating and electron withdrawing groups. The catalyst is reusable without significant decreases in its activity after four t...

Journal: :Synthesis 2011
Qin Zang Salim Javed Farman Ullah Aihua Zhou Christopher A Knudtson Danse Bi Fatima Z Basha Michael G Organ Paul R Hanson

The development of a 'click, click, cy-click' process utilizing a double aza-Michael reaction to generate functionalized 1,2,5-thiadiazepane 1,1-dioxides is reported. Optimization in flow, followed by scale out of the inter-/intramolecular double aza-Michael addition has also been realized using a microwave-assisted, continuous flow organic synthesis platform (MACOS). In addition, a facile one-...

Journal: :iranian journal of catalysis 2014
hossein eshghi mohammad rahimizadeh seyed mohsen mousavi

silica ferric hydrogensulfate is an efficient heterogeneous catalyst for the cyclization of 2- aminochalcones to the corresponding 2,3-dihydroquinolin- 4(1h)-ones. this intramolecular aza michael reaction was carried out in high yields using chalcones bearing of electron donating and electron withdrawing groups. the catalyst is reusable without significant decreases in its activity after four t...

Journal: :Polymer Chemistry 2022

This study highlights the potential of ?-hydroxy amines as building blocks for aza-Michael CANs.

Journal: :Organic & biomolecular chemistry 2011
Su-Jeong Lee Seok-Ho Youn Chang-Woo Cho

An unprecedented organocatalytic enantioselective formal synthesis of bromopyrrole alkaloid natural products is reported. An organocatalytic aza-Michael addition using pyrroles as the N-centered nucleophile is utilized as the enantioselective step to construct the nitrogen-substituted stereogenic carbon center in bromopyrrole alkaloids in good yield and excellent enantioselectivity. The aza-Mic...

Journal: :Organic & biomolecular chemistry 2011
Qiang Kang Yugen Zhang

Aza-Michael addition of amines, including aromatic and aliphatic amines, with α, β-unsaturated ketones was realized employing N-Heterocyclic Carbene (NHC) as organocatalyst, yielding β-amino ketones with up to 98% yield.

Journal: :Journal of materials chemistry. A, Materials for energy and sustainability 2022

This study reports the synthesis and characterization of biobased CANs incorporating CF 3 -activated aza-Michael bonds ester groups showing remarkable reprocessing abilities high activation energy.

Journal: :Chemical communications 2012
Yifei Li Xianxiu Xu Chunyu Xia Lingjuan Zhang Ling Pan Qun Liu

A novel and efficient route for the synthesis of 7-aza-tetrahydroindoles from N-aryl/alkyl-alkenoylacetamides and ethyl isocyanoacetate is described. A mechanism, involving a stepwise [3+2] cycloaddition-intramolecular aza-Michael addition cascade, is proposed that explains the origin of the double nucleophilic attack on the isocyanide carbon atom.

Journal: :Chemical communications 2008
Jihoon Lee Mi-hyun Kim Sang-sup Jew Hyeung-geun Park Byeong-Seon Jeong

A highly efficient phase-transfer catalytic aza-Michael addition of tert-butyl benzyloxycarbamate to a wide range of electron-deficient olefins is presented (90-99%).

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