An efficient method for retro-Claisen-type C–C bond cleavage of diketones with tropylium catalyst

2018 ◽  
Vol 54 (92) ◽  
pp. 12970-12973 ◽  
Author(s):  
M. A. Hussein ◽  
V. T. Huynh ◽  
R. Hommelsheim ◽  
R. M. Koenigs ◽  
T. V. Nguyen
Keyword(s):  
Efficient Method ◽  
Bond Cleavage ◽  
Environmentally Friendly ◽  
Type C

We report a new convenient and efficient method utilizing the tropylium ion as a mild and environmentally friendly organocatalyst to mediate retro-Claisen-type reactions.

Organophosphane-Catalyzed Construction of Functionalized 2-Ylideneoxindoles via Direct β-Acylation

Synthesis ◽  
2021 ◽  
Author(s):  
Wey-Chyng Jeng ◽  
Po-Chung Chien ◽  
Sandip Sambhaji Vagh ◽  
Athukuri Edukondalu ◽  
Wenwei Lin
Keyword(s):  
Intramolecular Cyclization ◽  
Efficient Method ◽  
Bond Cleavage ◽  
Scale Up ◽  
Acyl Chlorides ◽  
Metal Free ◽  
Mild Conditions ◽  
Synthetic Utility ◽  
Mechanistic Investigations ◽  
Synthetic Transformations

We report an efficient method for the direct β-acylation of 2-ylideneoxindoles with acyl chlorides in the presence of base-catalyzed by organophosphanes. A variety of functionalized 2-ylideneoxindoles were prepared in moderate to good yields under metal-free and mild conditions via a tandem phospha-Michael/O-acylation/intramolecular cyclization/ rearrangement sequence. The mechanistic investigations revealed that the C-O bond cleavage on possible betaine intermediate is the key step for the installation of keto-functionality at β-position of 2-ylideneoxindoles in a highly stereospecific manner. The synthetic utility of this protocol could also be proven by scale-up reactions and synthetic transformations of the products.

scholarly journals N-acylation of amides through internal nucleophilic catalysis

2020 ◽  
pp. 174751982092575
Author(s):  
Meng Yao ◽  
Xia Chen ◽  
Yuling Lu ◽  
Zhenhua Guan ◽  
Zengwei Luo ◽  
...  
Keyword(s):  
Natural Products ◽  
Efficient Method ◽  
Pyridine Ring ◽  
Environmentally Friendly ◽  
Biologically Active ◽  
Active Materials ◽  
Nucleophilic Catalysis

An efficient method for N-acylation of amides is described using a pyridine ring as the internal nucleophilic catalyst to give imides in moderate to excellent yields. The methodology provides a facile, air insensitive, and environmentally friendly route to form diversified imide scaffolds, which exist widely in natural products and biologically active materials.

Physicochemical properties of a urea/zinc chloride eutectic mixture and its improved effect on the fast and high yield synthesis of indeno[2,1-c]quinolines

2020 ◽  
Vol 44 (19) ◽  
pp. 7987-7997
Author(s):  
Diana Peña-Solórzano ◽  
Vladimir V. Kouznetsov ◽  
Cristian Ochoa-Puentes
Keyword(s):  
Physicochemical Properties ◽  
Efficient Method ◽  
Zinc Chloride ◽  
Acidic Medium ◽  
Eutectic Mixture ◽  
Environmentally Friendly ◽  
High Yield

An environmentally friendly and efficient method for the synthesis of indeno[2,1-c]quinolines is developed using a urea/zinc chloride eutectic mixture as a green mildly acidic medium.

Enzymatic waterborne polyurethane towards a robust and environmentally friendly anti-biofouling coating

RSC Advances ◽  
2016 ◽  
Vol 6 (38) ◽  
pp. 31698-31704 ◽  
Author(s):  
Kai Liu ◽  
Zhiguo Su ◽  
Shida Miao ◽  
Guanghui Ma ◽  
Songping Zhang
Keyword(s):  
Efficient Method ◽  
Castor Oil ◽  
Environmentally Friendly ◽  
Waterborne Polyurethane

A simple, green, robust and efficient method has been developed for the preparation of an anti-biofouling coating by directly mixing antifouling enzymes with a castor oil-based waterborne polyurethane (WPU) dispersion.

Environmentally friendly and efficient method for the synthesis of the new α , α ′‐diimine ligands with benzimidazole moiety

2020 ◽  
Vol 57 (6) ◽  
pp. 2466-2479
Author(s):  
Vakhid A. Mamedov ◽  
Nataliya A. Zhukova ◽  
Milyausha S. Kadyrova ◽  
Rezeda R. Fazleeva ◽  
Olga B. Bazanova ◽  
...  
Keyword(s):  
Efficient Method ◽  
Environmentally Friendly ◽  
Diimine Ligands

Electrochemical-mediated fixation of CO2: three-component synthesis of carbamate compounds from CO2, amines and N-alkenylsulfonamides

2021 ◽  
Author(s):  
Ting-Kai Xiong ◽  
Xue-Qi Zhou ◽  
Min Zhang ◽  
Hai-Tao Tang ◽  
Ying-Ming Pan ◽  
...  
Keyword(s):  
Efficient Method ◽  
Environmentally Friendly ◽  
Cascade Reaction

An electrocatalyzed three-component cascade reaction of CO2, amines, and N-alkenylsulfonamides is developed, providing an environmentally friendly and efficient method of synthesizing a series of new carbamate compounds. This reaction meets...

Metal-free n-Et4NBr-catalyzed radical cyclization of disulfides and alkynes leading to benzothiophenes under mild conditions

RSC Advances ◽  
2014 ◽  
Vol 4 (89) ◽  
pp. 48547-48553 ◽  
Author(s):  
Daoshan Yang ◽  
Kelu Yan ◽  
Wei Wei ◽  
Laijin Tian ◽  
Qinghe Li ◽  
...  
Keyword(s):  
Bond Cleavage ◽  
Bond Formation ◽  
Environmentally Friendly ◽  
Radical Cyclization ◽  
Title Reaction ◽  
Metal Free ◽  
Mild Conditions

The title reaction involves metal free TEAB-catalyzed S–S bond cleavage, C–S bond formation and C–C bond formation; it uses readily available disulfides and alkynes as substrates, and environmentally friendly TEAB as catalyst to synthesize useful benzothiophene derivatives.

scholarly journals A Green and Efficient Method for the Preparation of 3,4-Dihydropyrimidin-2(1H)-ones Using Quaternary Ammonium-Treated Clay in Water

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Soheil Sayyahi ◽  
Sedigheh Jahanbakhshi ◽  
Zahra Dehghani
Keyword(s):  
Efficient Method ◽  
Quaternary Ammonium ◽  
Biginelli Reaction ◽  
Environmentally Friendly

A variety of 3,4-dihydropyrimidin-2(1H)-ones derivatives were synthesized via three-component Biginelli reaction. The quaternary ammonium-treated clay-catalyzed process proved to be simple, efficient, and environmentally friendly.

Directed C–C bond cleavage of a cyclopropane intermediate generated fromN-tosylhydrazones and stable enaminones: expedient synthesis of functionalized 1,4-ketoaldehydes

2017 ◽  
Vol 53 (91) ◽  
pp. 12286-12289 ◽  
Author(s):  
Meiyan Ni ◽  
Jianguo Zhang ◽  
Xiaoyu Liang ◽  
Yaojia Jiang ◽  
Teck-Peng Loh
Keyword(s):  
Efficient Method ◽  
Bond Activation ◽  
Bond Cleavage ◽  
Quaternary Centers

An efficient method to construct functionalized 1,4-ketoaldehydes bearing all-carbon α-quaternary centersviaregioselective C–C bond activation has been described.

scholarly journals Lytic polysaccharide monooxygenase (LPMO) mediated production of ultra-fine cellulose nanofibres from delignified softwood fibres

2019 ◽  
Vol 21 (21) ◽  
pp. 5924-5933 ◽  
Author(s):  
Salla Koskela ◽  
Shennan Wang ◽  
Dingfeng Xu ◽  
Xuan Yang ◽  
Kai Li ◽  
...  
Keyword(s):  
Efficient Method ◽  
Energy Efficient ◽  
Environmentally Friendly ◽  
Oxidative Enzymes ◽  
Lytic Polysaccharide Monooxygenase ◽  
Lytic Polysaccharide Monooxygenases ◽  
Cellulose Nanofibres ◽  
Polysaccharide Monooxygenases ◽  
Polysaccharide Monooxygenase

An environmentally friendly, energy-efficient method for cellulose nanofibre (CNF) production from softwood holocellulose utilising oxidative enzymes, lytic polysaccharide monooxygenases (LPMOs).

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