scholarly journals Microporous polyurethane material for size selective heterogeneous catalysis of the Knoevenagel reaction

2016 ◽  
Vol 52 (50) ◽  
pp. 7834-7837 ◽  
Author(s):  
Sandeep Kumar Dey ◽  
Nader de Sousa Amadeu ◽  
Christoph Janiak
Keyword(s):  
Heterogeneous Catalysis ◽  
Knoevenagel Reaction ◽  
Bond Forming ◽  
Mild Conditions ◽  
Bond Forming Reactions ◽  
Type C ◽  
High Yields ◽  
First Time

For the first time, a microporous polyurethane (MPU) is prepared – it acts as an organocatalyst for aldol-type C–C bond forming reactions with high yields and under mild conditions.

B(C6F5)3-catalyzed metal-free hydrogenation of naphthylamines

2015 ◽  
Vol 13 (10) ◽  
pp. 2875-2878 ◽  
Author(s):  
Gen Li ◽  
Yongbing Liu ◽  
Haifeng Du
Keyword(s):  
Metal Free ◽  
Mild Conditions ◽  
Catalytic Metal ◽  
High Yields ◽  
First Time

A catalytic metal-free hydrogenation of naphthylamines using B(C6F5)3 was achieved under mild conditions for the first time to furnish tetrahydronaphthylamines in high yields.

scholarly journals C–C Bond formation catalyzed by natural gelatin and collagen proteins

2013 ◽  
Vol 9 ◽  
pp. 1111-1118 ◽  
Author(s):  
Dennis Kühbeck ◽  
Basab Bijayi Dhar ◽  
Eva-Maria Schön ◽  
Carlos Cativiela ◽  
Vicente Gotor-Fernández ◽  
...  
Keyword(s):  
Bond Formation ◽  
Scale Up ◽  
Product Yield ◽  
Order Rate Constant ◽  
Physiological Conditions ◽  
First Order ◽  
Bond Forming ◽  
Mild Conditions ◽  
Nitroaldol Reaction ◽  
First Time

The activity of gelatin and collagen proteins towards C–C bond formation via Henry (nitroaldol) reaction between aldehydes and nitroalkanes is demonstrated for the first time. Among other variables, protein source, physical state and chemical modification influence product yield and kinetics, affording the nitroaldol products in both aqueous and organic media under mild conditions. Significantly, the scale-up of the process between 4-nitrobenzaldehyde and nitromethane is successfully achieved at 1 g scale and in good yield. A comparative kinetic study with other biocatalysts shows an increase of the first-order rate constant in the order chitosan < gelatin < bovine serum albumin (BSA) < collagen. The results of this study indicate that simple edible gelatin can promote C–C bond forming reactions under physiological conditions, which may have important implications from a metabolic perspective.

Metal–metal redox synergy in selective B–H activation of ortho-carborane-9,12-dithiolate

2014 ◽  
Vol 50 (86) ◽  
pp. 13077-13080 ◽  
Author(s):  
Xiaolei Zhang ◽  
Zhiwen Zhou ◽  
Hong Yan
Keyword(s):  
Mild Conditions ◽  
Metal Metal ◽  
High Yields ◽  
Metal Redox ◽  
First Time

Metal–metal redox synergy is introduced, for the first time, for B–H functionalization of inert dicarba-dodecaboranes under mild conditions in high yields.

scholarly journals 1,2,3-Triazoles as leaving groups: SNAr reactions of 2,6-bistriazolylpurines with O- and C-nucleophiles

2021 ◽  
Vol 17 ◽  
pp. 410-419
Author(s):  
Dace Cīrule ◽  
Irina Novosjolova ◽  
Ērika Bizdēna ◽  
Māris Turks
Keyword(s):  
New Approach ◽  
Bond Forming ◽  
Mild Conditions ◽  
Leaving Group ◽  
Bond Forming Reactions ◽  
Leaving Groups

A new approach was designed for the synthesis of C6-substituted 2-triazolylpurine derivatives. A series of substituted products was obtained in SNAr reactions between 2,6-bistriazolylpurine derivatives and O- and C-nucleophiles under mild conditions. The products were isolated in yields up to 87%. The developed C–O and C–C bond forming reactions clearly show the ability of the 1,2,3-triazolyl ring at the C6 position of purine to act as leaving group.

Recent advances in asymmetric organocatalysis mediated by bifunctional amine–thioureas bearing multiple hydrogen-bonding donors

2015 ◽  
Vol 51 (7) ◽  
pp. 1185-1197 ◽  
Author(s):  
Xin Fang ◽  
Chun-Jiang Wang
Keyword(s):  
Hydrogen Bonding ◽  
Recent Progress ◽  
Bond Forming ◽  
Mild Conditions ◽  
Recent Advances ◽  
Bond Forming Reactions ◽  
Asymmetric Organocatalysis ◽  
Multiple Hydrogen Bonding

Recent progress in asymmetric organocatalysis, focusing on fine-tunable amine–thiourea catalysis, is described. Design of novel bifunctional amine–thiourea organocatalysts bearing multiple hydrogen-bonding donors and their applications in asymmetric C–C, C–N, and C–S bond-forming reactions under mild conditions are discussed.

Recent Advances on C-Se Bond-forming Reactions at Low and Room Temperature

2020 ◽  
Vol 23 (28) ◽  
pp. 3206-3225 ◽  
Author(s):  
Amol D. Sonawane ◽  
Mamoru Koketsu
Keyword(s):  
Room Temperature ◽  
Bond Formation ◽  
Bond Forming ◽  
Material Chemistry ◽  
Recent Advances ◽  
Bond Forming Reactions ◽  
Bond Formation Reactions

: Over the last decades, many methods have been reported for the synthesis of selenium- heterocyclic scaffolds because of their interesting reactivities and applications in the medicinal as well as in the material chemistry. This review describes the recent numerous useful methodologies on C-Se bond formation reactions which were basically carried out at low and room temperature.

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