A microwave assisted synthesis of benzoxazoles from carboxylic acids

Tetrahedron ◽  
2013 ◽  
Vol 69 (2) ◽  
pp. 791-795 ◽  
Author(s):  
Giammario Nieddu ◽  
Giampaolo Giacomelli
Keyword(s):  
Carboxylic Acids ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted

Efficient CDI/CH3SO3H -Catalyzed, Microwave-Assisted Synthesis of 2-Substituted Benzothiazoles

2018 ◽  
Vol 16 (1) ◽  
pp. 34-39
Author(s):  
Yao-Wei Li ◽  
Pei-Ming Zhang ◽  
Rui Li ◽  
Yan Bai ◽  
Yu Yu ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Carboxylic Acids ◽  
1H Nmr ◽  
Good Yield ◽  
Microwave Assisted Synthesis ◽  
Synthetic Method ◽  
Benzothiazole Derivatives ◽  
Microwave Assisted ◽  
Highly Effective

CDI combined with CH3SO3H was found to be highly effective for the cyclization of 2-aminothiophenol derivatives with carboxylic acids under MW condition. Fourteen benzothiazole derivatives were synthesized in good yield and their structures were characterized by 1H-NMR, 13CNMR, IR and mass spectrometry. This simple, rapid synthetic method is believed to provide a useful process for the synthesis of 2-substituted benzothiazole compounds.

ChemInform Abstract: Open Vessel Mode Microwave-Assisted Synthesis of 2-Oxazolines from Carboxylic Acids.

ChemInform ◽  
2010 ◽  
Vol 41 (5) ◽  
Author(s):  
Rishi Sharma ◽  
Subramaniah K. Vadivel ◽  
Richard I. Jr. Duclos ◽  
Alexandros Makriyannis
Keyword(s):  
Carboxylic Acids ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted

Microwave-assisted synthesis of coumarin-3-carboxylic acids under ytterbium triflate catalysis

2015 ◽  
Vol 56 (19) ◽  
pp. 2434-2436 ◽  
Author(s):  
Serena Fiorito ◽  
Salvatore Genovese ◽  
Vito Alessandro Taddeo ◽  
Francesco Epifano
Keyword(s):  
Carboxylic Acids ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Ytterbium Triflate

scholarly journals Open vessel mode microwave-assisted synthesis of 2-oxazolines from carboxylic acids

2009 ◽  
Vol 50 (42) ◽  
pp. 5780-5782 ◽  
Author(s):  
Rishi Sharma ◽  
Subramanian K. Vadivel ◽  
Richard I. Duclos ◽  
Alexandros Makriyannis
Keyword(s):  
Carboxylic Acids ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted

Microwave-Assisted Synthesis of Vinyl Esters through Ruthenium-Catalyzed Addition of Carboxylic Acids to Alkynes

2009 ◽  
Vol 62 (3) ◽  
pp. 227 ◽  
Author(s):  
François Nicks ◽  
Lionel Libert ◽  
Lionel Delaude ◽  
Albert Demonceau
Keyword(s):  
Carboxylic Acids ◽  
Efficient Method ◽  
Microwave Assisted Synthesis ◽  
Selective Synthesis ◽  
Terminal Alkynes ◽  
Vinyl Esters ◽  
Microwave Assisted ◽  
Enol Esters

A rapid and efficient method is described for the selective synthesis of enol esters via the microwave-accelerated addition of carboxylic acids to terminal alkynes. The method employs the readily available [RuCl2(p-cymene)(PPh3)] complex as catalyst without the need of bases, and reactions are complete in 20 min.

ChemInform Abstract: Microwave-Assisted Synthesis of Coumarin-3-carboxylic Acids under Ytterbium Triflate Catalysis.

ChemInform ◽  
2015 ◽  
Vol 46 (34) ◽  
pp. no-no
Author(s):  
Serena Fiorito ◽  
Salvatore Genovese ◽  
Vito Alessandro Taddeo ◽  
Francesco Epifano
Keyword(s):  
Carboxylic Acids ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Ytterbium Triflate

A New Aspect of the Pfitzinger Reaction: Microwave-assisted Synthesis of the New Heterocyclic Ring System 6-Arylbenzo[4,5]imidazolo[2,1-b]quino[4,3-e]-1,3-thiazin-14-one

2009 ◽  
Vol 64 (7) ◽  
pp. 826-830 ◽  
Author(s):  
Hatem A. Abdel-Aziz ◽  
Sobhi M. Gomha
Keyword(s):  
Microwave Irradiation ◽  
Carboxylic Acids ◽  
Heterocyclic Ring ◽  
Ring System ◽  
Conventional Heating ◽  
Microwave Assisted Synthesis ◽  
Efficient Synthesis ◽  
Pfitzinger Reaction ◽  
Microwave Assisted

We report herein on the utility of the Pfitzinger reaction in a facile two-step synthesis of the new heterocyclic ring system 6-arylbenzo[4,5]imidazolo[2,1-b]quino[4,3-e]-1,3-thiazin-14-one using microwave irradiation (MWI) and/or conventional heating. Microwave irradiation was used for a rapid and efficient synthesis of quinoline-4-carboxylic acids 6a - d from the reaction of isatin with 2-(1Hbenzimidazol- 2-ylthio)-1-arylethanones 3a - d. Cyclization of cinchoninic acids 6a - d afforded the fused title compounds 7a - d.

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