scholarly journals Continuous-Flow Synthesis of Thioureas, Enabled by Aqueous Polysulfide Solution

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 303
Author(s):  
András Gy. Németh ◽  
Renáta Szabó ◽  
György Orsy ◽  
István M. Mándity ◽  
György M. Keserű ◽  
...  
Keyword(s):  
Multicomponent Reaction ◽  
Continuous Flow ◽  
Flow Synthesis ◽  
Mild Conditions ◽  
Wide Range ◽  
Simple Filtration

We have developed the continuous-flow synthesis of thioureas in a multicomponent reaction starting from isocyanides, amidines, or amines and sulfur. The aqueous polysulfide solution enabled the application of sulfur under homogeneous and mild conditions. The crystallized products were isolated by simple filtration after the removal of the co-solvent, and the sulfur retained in the mother liquid. Presenting a wide range of thioureas synthesized by this procedure confirms the utility of the convenient continuous-flow application of sulfur.

scholarly journals Continuous flow synthesis of diaryl ketones by coupling of aryl Grignard reagents with acyl chlorides under mild conditions in the ecofriendly solvent 2-methyltetrahydrofuran

RSC Advances ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 2199-2204 ◽  
Author(s):  
Chuan-Tao Zhang ◽  
Rui Zhu ◽  
Zheng Wang ◽  
Bing Ma ◽  
Adrian Zajac ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Parallel Synthesis ◽  
Grignard Reagents ◽  
Acyl Chlorides ◽  
Flow Synthesis ◽  
Flow Method ◽  
Mild Conditions ◽  
Continuous Flow Method

Continuous flow method for parallel synthesis of diaryl ketones using commercially available reagents.

PEG/ZnBr2-Assisted Multicomponent Reactions: A Novel Procedure for the Synthesis of Functionalized 5,6-Dihydropyran-2-ones

Synlett ◽  
2018 ◽  
Vol 29 (07) ◽  
pp. 894-897 ◽  
Author(s):  
Mehdi Khalaj ◽  
Nasrin Farahani ◽  
Mahdieh Sadeghpour ◽  
Halimeh Rajabzadeh ◽  
Seyed Khatami
Keyword(s):  
Multicomponent Reaction ◽  
Multicomponent Reactions ◽  
Mild Conditions ◽  
Wide Range ◽  
Leaving Group ◽  
Novel Method

We report a catalytic multicomponent reaction of isocyanides, oxiranes, and malonates under mild conditions, allowing the transformation of a wide range of substrates into 5,6-dihydropyran-2-one products in acceptable yields. We have also examined the leaving group selectivity using an unsymmetrical malonate. This novel method demonstrates the benefits of combining different activation modes in oxiranes.

scholarly journals Assessing the possibilities of designing a unified multistep continuous flow synthesis platform

2018 ◽  
Vol 14 ◽  
pp. 1917-1936 ◽  
Author(s):  
Mrityunjay K Sharma ◽  
Roopashri B Acharya ◽  
Chinmay A Shukla ◽  
Amol A Kulkarni
Keyword(s):  
Detailed Analysis ◽  
Continuous Flow ◽  
Next Generation ◽  
One Pot ◽  
Complex Molecules ◽  
Flow Synthesis ◽  
One Pot Synthesis ◽  
Wide Range ◽  
Line Separation

The multistep flow synthesis of complex molecules has gained momentum over the last few years. A wide range of reaction types and conditions have been integrated seamlessly on a single platform including in-line separation as well as monitoring. Beyond merely getting considered as ‘flow version’ of conventional ‘one-pot synthesis’, multistep flow synthesis has become the next generation tool for creating libraries of new molecules. Here we give a more ‘engineering’ look at the possibility of developing a ‘unified multistep flow synthesis platform’. A detailed analysis of various scenarios is presented considering 4 different classes of drugs already reported in the literature. The possible complexities that an automated and controlled platform needs to handle are also discussed in detail. Three different design approaches are proposed: (i) one molecule at a time, (ii) many molecules at a time and (iii) cybernetic approach. Each approach would lead to the effortless integration of different synthesis stages and also at different synthesis scales. While one may expect such a platform to operate like a ‘driverless car’ or a ‘robo chemist’ or a ‘transformer’, in reality, such an envisaged system would be much more complex than these examples.

Double Ring-Closing Approach for the Synthesis of 2,3,6,7-Substituted Anthracene Derivatives

2020 ◽  
Author(s):  
Birgit Meindl ◽  
Katharina Pfennigbauer ◽  
Berthold Stöger ◽  
Martin Heeney ◽  
Florian Glöcklhofer
Keyword(s):  
Wittig Reaction ◽  
Condensation Reaction ◽  
Synthetic Methods ◽  
Anthracene Derivative ◽  
Double Ring ◽  
Mild Conditions ◽  
Wide Range ◽  
Anthracene Derivatives

Anthracene derivatives have been used for a wide range of applications and many different synthetic methods for their preparation have been developed. However, despite continued synthetic efforts, introducing substituents in some positions has remained difficult. Here we present a method for the synthesis of 2,3,6,7-substituted anthracene derivatives, one of the most challenging anthracene substitution patterns to obtain. The method is exemplified by the preparation of 2,3,6,7-anthracenetetracarbonitrile and employs a newly developed, stable protected 1,2,4,5-benzenetetracarbaldehyde as the precursor. The precursor can be obtained in two scalable synthetic steps from 2,5-dibromoterephthalaldehyde and is converted into the anthracene derivative by a double intermolecular Wittig reaction under very mild conditions followed by a deprotection and intramolecular double ring-closing condensation reaction. Further modification of the precursor is expected to enable the introduction of additional substituents in other positions and may even enable the synthesis of fully substituted anthracene derivatives by the presented approach.<br>

scholarly journals Electrochemical multicomponent synthesis of 4-selanylpyrazoles under catalyst- and chemical-oxidant-free conditions

2021 ◽  
Author(s):  
Yan Wu ◽  
Jin-Yang Chen ◽  
Jing Ning ◽  
Xue Jiang ◽  
Jie Deng ◽  
...  
Keyword(s):  
Multicomponent Reaction ◽  
Raw Materials ◽  
Multicomponent Synthesis ◽  
Mild Conditions ◽  
Simple Protocol ◽  
High Yields

An electrochemical multicomponent reaction was established under catalyst-, chemical-oxidant-free and mild conditions, which provides an eco-friendly and simple protocol for constructing 4-selanylpyrazoles from easily available raw materials with high yields.

Continuous flow synthesis of the lamivudine precursor L-Menthyl Glyoxylate

2021 ◽  
Author(s):  
Lais S. D. Azevedo ◽  
Anderson R. Aguillon ◽  
Marcelo T. Lima ◽  
Raquel A. C. Leão ◽  
Rodrigo O. M. A. de Souza
Keyword(s):  
Continuous Flow ◽  
Flow Synthesis

Continuous Flow Synthesis of Persistent Luminescent Chromium-Doped Zinc Gallate Nanoparticles

2021 ◽  
pp. 7067-7075
Author(s):  
Xiaojun Wei ◽  
Stephen V. Kershaw ◽  
Xiaodan Huang ◽  
Mingxia Jiao ◽  
Chau Chun Beh ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Flow Synthesis ◽  
Zinc Gallate

scholarly journals Continuous flow synthesis of azoxybenzenes by reductive dimerization of nitrosobenzenes with gel‐bound catalysts

2021 ◽  
Author(s):  
Carsten J. Schmiegel ◽  
Patrik Berg ◽  
Franziska Obst ◽  
Roland Schoch ◽  
Dietmar Appelhans ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Flow Synthesis ◽  
Reductive Dimerization

scholarly journals Photocatalytic three-component asymmetric sulfonylation via direct C(sp3)-H functionalization

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Shi Cao ◽  
Wei Hong ◽  
Ziqi Ye ◽  
Lei Gong
Keyword(s):  
Asymmetric Catalysis ◽  
Organic Synthesis ◽  
Photochemical Reaction ◽  
Low Cost ◽  
Bioactive Molecules ◽  
Atom Economy ◽  
Mild Conditions ◽  
Wide Range ◽  
Unsaturated Carbonyl Compound ◽  
Direct Functionalization

AbstractThe direct and selective C(sp3)-H functionalization of cycloalkanes and alkanes is a highly useful process in organic synthesis owing to the low-cost starting materials, the high step and atom economy. Its application to asymmetric catalysis, however, has been scarcely explored. Herein, we disclose our effort toward this goal by incorporation of dual asymmetric photocatalysis by a chiral nickel catalyst and a commercially available organophotocatalyst with a radical relay strategy through sulfur dioxide insertion. Such design leads to the development of three-component asymmetric sulfonylation involving direct functionalization of cycloalkanes, alkanes, toluene derivatives or ethers. The photochemical reaction of a C(sp3)-H precursor, a SO2 surrogate and a common α,β-unsaturated carbonyl compound proceeds smoothly under mild conditions, delivering a wide range of biologically interesting α-C chiral sulfones with high regio- and enantioselectivity (>50 examples, up to >50:1 rr and 95% ee). This method is applicable to late-stage functionalization of bioactive molecules, and provides an appealing access to enantioenriched compounds starting from the abundant hydrocarbon compounds.

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