AUTHOR OF THIS BLOG

DR ANTHONY MELVIN CRASTO, WORLDDRUGTRACKER

An efficient way for the N-formylation of amines by inorganic-ligand supported iron catalysis

 organic chemistry, SYNTHESIS  Comments Off on An efficient way for the N-formylation of amines by inorganic-ligand supported iron catalysis
Jan 162020
 

Graphical abstract: An efficient way for the N-formylation of amines by inorganic-ligand supported iron catalysis

 

An efficient way for the N-formylation of amines by inorganic-ligand supported iron catalysis

Green Chem., 2020, Advance Article

DOI: 10.1039/C9GC03564H, Paper
Zhikang Wu, Yongyan Zhai, Wenshu Zhao, Zheyu Wei, Han Yu, Sheng Han, Yongge Wei
A green and highly efficient N-formylation of amines using formic acid as the acylating agent by iron catalysis with excellent selectivity and yields.
To cite this article before page numbers are assigned, use the DOI form of citation above.
The content of this RSS Feed (c) The Royal Society of Chemistry

An efficient way for the N-formylation of amines by inorganic-ligand supported iron catalysis

 Author affiliations

Abstract

The first example of an inorganic-ligand supported iron(III) catalysed coupling of formic acid and amines to form formamides is reported. The pure inorganic catalyst (NH4)3[FeMo6O18(OH)6] (1), which consists of a central FeIII single-atomic core supported within a cycle-shaped inorganic ligand consisting of six MoVIO6 octahedra, shows excellent activity and selectivity, and avoids the use of complicated/commercially unavailable organic ligands. Various primary amines and secondary amines have been successfully transformed into the corresponding formamides under mild conditions, and the formylation of primary diamines has also been achieved for the first time. The Fe catalyst 1 can be reused several times without appreciable loss of activity.

STR1

Image result for Zhikang Wu School of Chemical and Environmental Engineering Shanghai Institute of Technology, No. 100 Haiquan Road, Shanghai 201418, P.R. China

Share

Catalyst- and Additive-Free Baeyer−Villiger-type Oxidation of α-Iodocyclopentenones to α-Pyrones: Using Air as the Oxidant

 ANTHONY CRASTO, organic chemistry, spectroscopy, SYNTHESIS  Comments Off on Catalyst- and Additive-Free Baeyer−Villiger-type Oxidation of α-Iodocyclopentenones to α-Pyrones: Using Air as the Oxidant
Sep 112019
 

Catalyst- and Additive-Free Baeyer−Villiger-type Oxidation of α-Iodocyclopentenones to α-Pyrones: Using Air as the Oxidant

Abstract

An efficient synthetic approach for the synthesis of α-pyrones via Baeyer−Villiger-type oxidation of α-iodocyclopentenones through a catalyst- and additive-free system using air as an environmentally benign oxidant is described. The reaction exhibits excellent functional group compatibility and provides a simple and efficient protocol for the construction of highly functionalized α-pyrones under mild reaction conditions.

Ethyl 4-(4-cyclopropyl-2-oxo-2H-pyran-6-yl)butanoate (2aa) Product 2aa was obtained as yellow oil in 50% yield (38 mg) following the general procedure; 1H NMR (600 MHz, CDCl3) δ 5.84 (s, 1H), 5.61 (s, 1H), 4.13-4.09 (m, 2H), 2.48 (t, J = 7.3 Hz, 2H), 2.33 (td, J = 7.3, 2.3 Hz, 2H), 1.97-1.94 (m, 2H), 1.66-1.63 (m, 1H), 1.26-1.22 (m, 3H), 1.07-1.05 (m, 2H), 0.80-0.79 (m, 2H); 13C NMR (150 MHz, CDCl3) δ 172.8, 163.9, 163.0, 162.8, 106.7, 102.1, 60.5, 33.2, 33.0, 22.1, 15.4, 14.2, 10.0; HRMS (ESI) calcd. for C14H18O4Na [M+Na]+ : 273.1097, found: 273.1101

 

str1 str2

////////////

https://pubs.rsc.org/en/Content/ArticleLanding/2019/GC/C9GC02725D?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+rss%2FGC+%28RSC+-+Green+Chem.+latest+articles%29#!divAbstract

http://www.rsc.org/suppdata/c9/gc/c9gc02725d/c9gc02725d1.pdf

Share

Triple copper catalysis for the synthesis of vinyl triazoles

 green chemistry, organic chemistry  Comments Off on Triple copper catalysis for the synthesis of vinyl triazoles
Jul 012019
 
Graphical abstract: Triple copper catalysis for the synthesis of vinyl triazoles
Green Chem., 2019, Advance Article
DOI: 10.1039/C9GC01066A, Communication
Lucas L. Baldassari, Eduardo A. Cechinatto, Angélica V. Moro
Herein, we report our studies on the synthesis of vinyl 1,2,3-triazoles through a one-pot sequence, enabled by the same copper catalyst, of three different reactions: hydroboration involving an alkyne, azidation for a vinyl boronate and azide–alkyne cycloaddition.
To cite this article before page numbers are assigned, use the DOI form of citation above.
The content of this RSS Feed (c) The Royal Society of Chemistry

Triple copper catalysis for the synthesis of vinyl triazoles

 Author affiliations

Abstract

Herein, we report our studies on the synthesis of vinyl 1,2,3-triazoles through a one-pot sequence, enabled by the same copper catalyst, of three different reactions: hydroboration involving an alkyne, azidation for a vinyl boronate and azide–alkyne cycloaddition.

https://pubs.rsc.org/en/Content/ArticleLanding/2019/GC/C9GC01066A?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+rss%2FGC+%28RSC+-+Green+Chem.+latest+articles%29#!divAbstract

///////copper catalysis,  vinyl triazoles

Share

Basic Anion-Exchange Resin-Catalyzed Aldol Condensation of Aromatic Ketones with Aldehydes in Continuous Flow

 organic chemistry, PROCESS  Comments Off on Basic Anion-Exchange Resin-Catalyzed Aldol Condensation of Aromatic Ketones with Aldehydes in Continuous Flow
Apr 262019
 
Abstract Image

A general method for the aldol condensation of aromatic ketones with aldehydes was developed under continuous-flow conditions using a commercially available, strongly basic anion-exchange resin (A26) as catalyst. This procedure, in addition to exhibiting a wide substrate scope, promoted carbon–carbon bond formation under mild conditions using a quasi-stoichiometric ratio of starting reagents with good to excellent yields, thereby forming a limited amount of waste and allowing the process to be applied to sequential-flow systems. A proof of concept was developed in the first fully heterogeneously catalyzed two-step flow synthesis of donepezil, which is a blockbuster commercial anti-Alzheimer’s drug.

Basic Anion-Exchange Resin-Catalyzed Aldol Condensation of Aromatic Ketones with Aldehydes in Continuous Flow

Department of Chemistry, School of Science, and Green & Sustainable Chemistry Social Cooperation Laboratory, Graduate School of ScienceThe University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
Org. Process Res. Dev., Article ASAP
DOI: 10.1021/acs.oprd.9b00048

https://pubs.acs.org/doi/10.1021/acs.oprd.9b00048

////////donepezil

Share

Structural evolution of carbon in an Fe@C catalyst during the Fischer–Tropsch synthesis reaction

 ANTHONY CRASTO, organic chemistry, SYNTHESIS  Comments Off on Structural evolution of carbon in an Fe@C catalyst during the Fischer–Tropsch synthesis reaction
Feb 012019
 

Graphical abstract: Structural evolution of carbon in an Fe@C catalyst during the Fischer–Tropsch synthesis reaction

Structural evolution of carbon in an Fe@C catalyst during the Fischer–Tropsch synthesis reaction

 Author affiliations

Abstract

A pseudo-in situ research method was applied to provide insight into the structural evolution of carbon in an Fe@C catalyst at different stages of the Fischer–Tropsch reaction. Five typical stages of the catalyst were selected for in-depth structural investigation; these were: the fresh catalyst, reduced catalyst, and catalyst in the stable conversion period, in an increased-conversion period and at the inactivation stage. The results indicated that the integral structure of Fe@C constantly changed in the Fischer–Tropsch reaction. Iron carbide transformed from the Fe phase that was easily oxidized under high temperature Fischer–Tropsch conditions, and the carbon framework was completely destroyed in the reaction process, leading to a drastic decrease in the specific surface area of the material. This destruction could have two opposing effects: on the one hand, the loss of carbon could re-expose the active sites that have been covered by carbon at a reaction temperature of 320 °C and favor the reaction; on the other hand, the deposition of carbon could block the active sites and lead to inactivation when the reaction temperature is over 340 °C.

https://pubs.rsc.org/en/Content/ArticleLanding/2019/CY/C8CY02420K?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+rss%2Fcy+%28RSC+-+Catalysis+Science+%26+Technology+latest+articles%29#!divAbstract

////////Fischer–Tropsch

Share

Photo-organocatalytic synthesis of acetals from aldehydes

 organic chemistry, spectroscopy, SYNTHESIS  Comments Off on Photo-organocatalytic synthesis of acetals from aldehydes
Jan 292019
 

Graphical abstract: Photo-organocatalytic synthesis of acetals from aldehydes

Abstract

A mild and green photo-organocatalytic protocol for the highly efficient acetalization of aldehydes has been developed. Utilizing thioxanthenone as the photocatalyst and inexpensive household lamps as the light source, a variety of aromatic and aliphatic aldehydes have been converted into acyclic and cyclic acetals in high yields. The reaction mechanism was extensively studied

Photo-organocatalytic synthesis of acetals from aldehydes

 Author affiliations

https://pubs.rsc.org/en/Content/ArticleLanding/2019/GC/C8GC03605E?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+rss%2FGC+%28RSC+-+Green+Chem.+latest+articles%29#!divAbstract

STR1

(3,3-Dimethoxypropyl)benzene (2a)6

Colorless oil; 95% yield; 1H NMR (200 MHz, CDCl3) δ: 7.33-7.18 (5H, m, ArH), 4.37 (1H, t, J = 5.8 Hz, OCH), 3.33 (6H, s, 2 x OCH3), 2.68 (2H, t, J = 7.6 Hz, CH2), 1.98- 1.87 (2H, m, CH2); 13C NMR (50 MHz, CDCl3) δ: 141.8, 128.4, 125.9, 103.7, 52.8, 34.0, 30.8; MS (ESI) m/z 181 [M+H]+ .

6. Q. Zhou, T. Jia. X.-X. Li, L. Zhou, C.-J. Li, Y. S. Feng, Synth. Commun., 2018, 48, 1068.

.////////////////

Share

Development of an SNAr Reaction: A Practical and Scalable Strategy To Sequester and Remove HF

 organic chemistry, SYNTHESIS  Comments Off on Development of an SNAr Reaction: A Practical and Scalable Strategy To Sequester and Remove HF
Sep 142018
 

Abstract Image

A simple and operationally practical method to sequester and remove fluoride generated through the SNAr reaction between amines and aryl fluorides is reported. Calcium propionate acts as an inexpensive and environmentally benign in situ scrubber of the hydrofluoric acid byproduct, which is simply precipitated and filtered from the reaction mixture during standard aqueous workup. The method has been tested from 10 to 100 g scale of operation, showing >99.5% decrease in fluoride content in each case. Full mass recovery of calcium fluoride is demonstrated at both scales, proving this to be a general, efficient, and robust method of fluoride abstraction to help prevent corrosion of glass-lined reactors.

Development of an SNAr Reaction: A Practical and Scalable Strategy To Sequester and Remove HF

 Institute of Process Research and Development, School of Chemistry and School of Chemical and Process EngineeringUniversity of Leeds, Leeds LS2 9JT, United Kingdom
 Chemical DevelopmentAstraZeneca, Macclesfield SK10 2NA, United Kingdom
Org. Process Res. Dev., Article ASAP
DOI: 10.1021/acs.oprd.8b00090

///////////////aryl amines, calcium fluoride, fluoride sequestration, scale-up, SNAr reaction,

“ALL FOR DRUGS” CATERS TO EDUCATION GLOBALLY, No commercial exploits are done or advertisements added by me. This is a compilation for educational purposes only. P.S. : The views expressed are my personal and in no-way suggest the views of the professional body or the company that I represent
Share

Process Development of Febuxostat Using Palladium- and Copper-Catalyzed C–H Arylation

 MANUFACTURING, organic chemistry, spectroscopy, SYNTHESIS  Comments Off on Process Development of Febuxostat Using Palladium- and Copper-Catalyzed C–H Arylation
Sep 112018
 
Abstract Image

There is significant interest in the development of process routes for active pharmaceutical ingredients using C–H arylation methodology. An efficient and practical synthetic route for febuxostat (1), which is the first non-purine-type xanthine oxidase inhibitor, was established via palladium- and copper-catalyzed C–H arylation of thiazole with aryl bromide. The catalyst loading was reduced to 0.1 mol % for the intermolecular C–H arylation, and a three-step synthesis produced febuxostat in 89% overall yield with excellent selectivity

Process Development of Febuxostat Using Palladium- and Copper-Catalyzed C–H Arylation

Active Pharmaceutical Ingredient Technology Section, Pharmaceutical Preparation DepartmentTeijin Pharma Limited2-1 Hinode-cho, Iwakuni-shi, Yamaguchi 740-8511, Japan
Org. Process Res. Dev., Article ASAP
DOI: 10.1021/acs.oprd.8b00164

https://pubs.acs.org/doi/10.1021/acs.oprd.8b00164

1 (22.5 g, 98%) as a whitish solid. 1H NMR (400 MHz, CDCl3): δ 8.20 (d, J = 2.4 Hz, 1H), 8.11 (dd, J = 9.0 Hz, 2.4 Hz, 1H), 7.03 (d, J = 9.0 Hz, 1H), 3.91 (d, J = 6.6 Hz, 2H), 2.80 (s, 3H), 2.23–2.20 (m, 1H), 1.20 (d, J = 6.8 Hz, 6H).

 

//////FEBUXOSTAT

“ALL FOR DRUGS” CATERS TO EDUCATION GLOBALLY, No commercial exploits are done or advertisements added by me. This is a compilation for educational purposes only. P.S. : The views expressed are my personal and in no-way suggest the views of the professional body or the company that I represent

Share

Ethyl 4, 6-dichloro-1H-indole-2-carboxylate

 organic chemistry, spectroscopy, SYNTHESIS  Comments Off on Ethyl 4, 6-dichloro-1H-indole-2-carboxylate
Aug 282018
 

Ethyl 4, 6-dichloro-1H-indole-2-carboxylate

STR1 STR2

ethyl 4,6-dichloro-1H-indole-2-carboxylate (1a) (2.70 kg, 99.5%).

Mp 187–188 °C; HRMS (ESI) m/z [M – H] calcd for C11H8NO2Cl2 255.9927, found 255.9930;

1H NMR (400 MHz, DMSO-d6) δ 12.41 (s, 1H), 7.44 (s, 1H), 7.27 (s, 1H), 7.10 (s, 1H), 4.43–4.30 (q, 2H), 1.34 (d, 3H);

13C NMR (151 MHz, CDCl3) δ 161.69, 137.08, 131.00, 128.45, 128.37, 125.31, 121.26, 110.52, 107.07, 61.56, 14.32;

IR (cm–1) 3314.3, 2987.6, 1700.2, 1615.8, 1566.2, 1523.7, 1487.2, 1323.3, 1247.2, 1072.4, 840.1, 770.2.

Org. Process Res. Dev., Article ASAP
DOI: 10.1021/acs.oprd.8b00144

https://pubs.acs.org/doi/suppl/10.1021/acs.oprd.8b00144/suppl_file/op8b00144_si_001.pdf

///////////

Share

A versatile biosynthetic approach to amide bond formation

 organic chemistry, SYNTHESIS  Comments Off on A versatile biosynthetic approach to amide bond formation
Aug 022018
 

Graphical abstract: A versatile biosynthetic approach to amide bond formation

A versatile biosynthetic approach to amide bond formation

 Author affiliations

Abstract

The development of versatile and sustainable catalytic strategies for amide bond formation is a major objective for the pharmaceutical sector and the wider chemical industry. Herein, we report a biocatalytic approach to amide synthesis which exploits the diversity of Nature’s amide bond forming enzymes, N-acyltransferases (NATs) and CoA ligases (CLs). By selecting combinations of NATs and CLs with desired substrate profiles, non-natural biocatalytic pathways can be built in a predictable fashion to allow access to structurally diverse secondary and tertiary amides in high yield using stoichiometric ratios of carboxylic acid and amine coupling partners. Transformations can be performed in vitro using isolated enzymes, or in vivo where reactions rely solely on cofactors generated by the cell. The utility of these whole cell systems is showcased through the preparative scale synthesis of a key intermediate of Losmapimod (GW856553X), a selective p38-mitogen activated protein kinase inhibitor.

http://pubs.rsc.org/en/Content/ArticleLanding/2018/GC/C8GC01697F?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+rss%2FGC+%28RSC+-+Green+Chem.+latest+articles%29#!divAbstract

////////////biosynthetic,  amide bond

Share
Follow

Get every new post on this blog delivered to your Inbox.

Join other followers: