The Highly Selective Synthesis of 5-Methy Vanillin from the By-product in Vanilla Industry and The Scent Influence for Vanillin

2021 ◽  
Author(s):  
Haifang Mao ◽  
Hongzhao Wang ◽  
Ting Tang ◽  
Shi Qixuan ◽  
Haiyan Yu ◽  
...  
Keyword(s):  
Selective Synthesis ◽  
Selective Method ◽  
Comprehensive Utilization

Aimed on comprehensive utilization of useless by-product, a highly selective method was proposed for 5-methyl vanillin (M-Vanillin) production by employing the o-Vanillin which is a useless by-product in vanillin industry...

scholarly journals Selective synthesis of α-organylthio esters and α-organylthio ketones from β-keto esters and sodium S-organyl sulfurothioates under basic conditions

2021 ◽  
Vol 17 ◽  
pp. 234-244
Author(s):  
Jean C Kazmierczak ◽  
Roberta Cargnelutti ◽  
Thiago Barcellos ◽  
Claudio C Silveira ◽  
Ricardo F Schumacher
Keyword(s):  
Reaction Time ◽  
The Other ◽  
Selective Synthesis ◽  
Selective Method ◽  
Keto Esters ◽  
Other Hand ◽  
Bunte Salts

We described herein a selective method to prepare α-organylthio esters and α-organylthio ketones by the reaction of β-keto esters with sodium S-benzyl sulfurothioate or sodium S-alkyl sulfurothioate (Bunte salts) under basic conditions in toluene as the solvent at 100 °C. When 4 equivalents of a base were used, a series of differently substituted α-thio esters were obtained with up to 90% yield. On the other hand, employing 2 equivalents of a base, α-thio ketones were achieved after 18 h under air. Furthermore, after a shorter reaction time, the isolation of keto–enol tautomers was possible, revealing them as significant intermediates for the mechanism elucidation.

HPLC-DAD selective method for ginger root powder and extracts nauseastop as standarized not mutagenic ginger extract

Planta Medica ◽  
2014 ◽  
Vol 80 (10) ◽  
Author(s):  
JA Marañón ◽  
L de los Santos ◽  
C Lozano ◽  
E Caballero ◽  
F Galán-Estella
Keyword(s):  
Ginger Extract ◽  
Selective Method

RetroBioCat: Computer-Aided Synthesis Planning for Biocatalytic Reactions and Cascades

2020 ◽  
Author(s):  
William Finnigan ◽  
Lorna J. Hepworth ◽  
Nicholas J. Turner ◽  
Sabine Flitsch
Keyword(s):  
Organic Chemistry ◽  
Computer Aided Design ◽  
Selective Synthesis ◽  
Test Set ◽  
Synthesis Design ◽  
Computer Aided ◽  
Synthesis Planning ◽  
Enzymatic Cascades ◽  
Target Molecules ◽  
Aided Design

As the enzyme toolbox for biocatalysis has expanded, so has the potential for the construction of powerful enzymatic cascades for efficient and selective synthesis of target molecules. Additionally, recent advances in computer-aided synthesis planning (CASP) are revolutionizing synthesis design in both synthetic biology and organic chemistry. However, the potential for biocatalysis is not well captured by tools currently available in either field. Here we present RetroBioCat, an intuitive and accessible tool for computer-aided design of biocatalytic cascades, freely available at retrobiocat.com. Our approach uses a set of expertly encoded reaction rules encompassing the enzyme toolbox for biocatalysis, and a system for identifying literature precedent for enzymes with the correct substrate specificity where this is available. Applying these rules for automated biocatalytic retrosynthesis, we show our tool to be capable of identifying promising biocatalytic pathways to target molecules, validated using a test-set of recent cascades described in the literature.

Enantioselective Synthesis of Azamerone

2018 ◽  
Author(s):  
Matthew L. Landry ◽  
Grace McKenna ◽  
Noah Burns
Keyword(s):  
Late Stage ◽  
Cross Coupling ◽  
Enantioselective Synthesis ◽  
Selective Synthesis

A concise and selective synthesis of the dichlorinated meroterpenoid azamerone is described. The paucity of tactics for the synthesis of chiral organochlorides motivated the development of unique strategies for accessing these motifs in enantioenriched forms. The route features a novel enantioselective chloroetherification reaction, a Pd-catalyzed cross-coupling between a quinone diazide and a boronic hemiester, and a late-stage tetrazine [4+2]-cycloaddition/oxidation cascade.

Enantioselective Synthesis of Azamerone

2018 ◽  
Author(s):  
Matthew L. Landry ◽  
Grace McKenna ◽  
Noah Burns
Keyword(s):  
Late Stage ◽  
Cross Coupling ◽  
Enantioselective Synthesis ◽  
Selective Synthesis

A concise and selective synthesis of the dichlorinated meroterpenoid azamerone is described. The paucity of tactics for the synthesis of chiral organochlorides motivated the development of unique strategies for accessing these motifs in enantioenriched forms. The route features a novel enantioselective chloroetherification reaction, a Pd-catalyzed cross-coupling between a quinone diazide and a boronic hemiester, and a late-stage tetrazine [4+2]-cycloaddition/oxidation cascade.

Selective α,α-Dibromination of Arylethanones with Copper(II) Bromide

2019 ◽  
Vol 16 (9) ◽  
pp. 700-704
Author(s):  
Jitander K. Kapoor ◽  
Loveena Arora ◽  
Om Prakash
Keyword(s):  
Ethyl Acetate ◽  
Heterogeneous System ◽  
Side Chain ◽  
Selective Synthesis ◽  
Aromatic Ketones

Various arylethanones including electron-rich aromatic ketones such as o-hydroxyacetophenone and its p-isomer underwent selective side-chain α,α-dibromination using a heterogeneous system consisting of four molar equivalents of copper(II) bromide in chloroform-ethyl acetate under reflux. This study provides the cleanest method for the selective synthesis of several synthetically useful α,α-dibromoketones which are otherwise difficult to prepare.

Highly Selective Synthesis of Carboxamides via Transition Metal Catalysed Aminocarbonylation

2015 ◽  
Vol 2 (3) ◽  
pp. 319-338 ◽  
Author(s):  
Mercedesz Kiss ◽  
Attila Takacs ◽  
Laszlo Kollar
Keyword(s):  
Transition Metal ◽  
Selective Synthesis
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