26087-01-4Relevant academic research and scientific papers
A Bu4N[Fe(CO)3(NO)]-Catalyzed Hemetsberger–Knittel Indole Synthesis
Baykal, Aslihan,Plietker, Bernd
, (2020/02/20)
The nucleophilic Fe complex Bu4N[Fe(CO)3(NO)] (TBA[Fe]) catalyzes the direct intramolecular amination of aryl vinyl azides to give the corresponding indole derivatives in good to excellent yields.
A new synthetic strategy towards 2,4,5-trisubstituted 1H-imidazoles and highly substituted pyrrolo[1,2-c]imidazoles by use of α-azidochalcones via Michael addition-cyclization followed by Wittig reaction
Adib, Mehdi,Peytam, Fariba,Rahmanian-Jazi, Mahmoud,Bijanzadeh, Hamid Reza,Amanlou, Massoud
, p. 6696 - 6705 (2017/10/25)
Efficient and facile protocols for the preparation of highly functionalized 1H-imidazoles and 5H-pyrrolo[1,2-c]imidazoles are described. Heating a mixture of an α-azidochalcones and N,N,N′,N′-tetramethyl guanidine under neat conditions gave the corresponding 2,4,5-trisubstituted 1H-imidazole via Michael addition-cyclization in excellent yields. Subsequently, the prepared 1H-imidazoles undergo addition-Wittig reaction with acetylenic esters in presence of triphenylphosphine in dichloromethane to afford 5H-pyrrolo[1,2-c]imidazoles in high yields.
Visible-Light-Mediated Synthesis of Pyrazines from Vinyl Azides Utilizing a Photocascade Process
Hossain, Asik,Pagire, Santosh K.,Reiser, Oliver
supporting information, p. 1707 - 1714 (2017/11/27)
A convenient method for the synthesis of substituted pyrazines from vinyl azides has been developed. This method is enabled by a dual-energy and electron-transfer strategy by visible-light photocatalysis. Initially, vinyl azides are activated by a triplet sensitization process from an excited ruthenium photocatalyst in the presence of water to form dihydropyrazines, followed by a single-electron-transfer (SET) process under oxygen (air) atmosphere that leads to the tetrasubstituted pyrazines in good to excellent yields.
A multi-substituted 4 - hydroxy pyrazole derivatives of the preparation method
-
Paragraph 0025; 0026; 0027, (2017/08/25)
The invention provides a preparation method of a multi-substituted 4-hydroxypyrazole derivative. An alkenyl azide derivative and a hydrazine compound which are chemically synthesized easily are generated under the condition of room temperature. The provid
One-pot three-component approach to the synthesis of polyfunctional pyrazoles
Zhang, Guolin,Ni, Hangcheng,Chen, Wenteng,Shao, Jiaan,Liu, Huan,Chen, Binhui,Yu, Yongping
supporting information, p. 5967 - 5969 (2014/01/06)
A simple, multicomponent, and straightforward reaction of vinyl azide, aldehyde, and tosylhydrazine affords the construction of 3,4,5-trisubstituted 1H-pyrazoles regioselectively in the presence of base with moderate to excellent yields. A range of functionality could be tolerated in this methodology, and a possible mechanism is proposed.
Indium trichloride catalyzed regioselective synthesis of substituted pyrroles in water
Suresh, Rajendran,Muthusubramanian, Shanmugam,Nagaraj, Muthupandi,Manickam, Govindaswamy
supporting information, p. 1779 - 1784 (2013/04/23)
A facile and regioselective synthesis of polysubstituted pyrroles from α-azido chalcones and 1,3-dicarbonyl compounds is described. Indium trichloride in water is found to be efficient in catalyzing this transformation.
Unexpected synthesis of 2,4,5-trisubstituted oxazoles via a tandem aza-wittig/michael/isomerization reaction of vinyliminophosphorane
Xie, Hai,Yuan, Ding,Ding, Ming-Wu
scheme or table, p. 2954 - 2958 (2012/06/01)
2,4,5-Trisubstituted oxazoles 6 were unexpectedly prepared from a tandem reaction of vinyliminophosphorane 3 with various acyl chlorides in a one-pot fashion.
Temperature-dependent regioselective synthesis of 1,2,4-triazino[2,3-b] indazoles and 3H-1,4-benzodiazepines by domino-Staudinger/aza-Wittig/ isomerization reaction
Xie, Hai,Yu, Jian-Bo,Ding, Ming-Wu
scheme or table, p. 6933 - 6938 (2012/01/02)
o-Azidobenzaldimine 8 reacted with triphenylphosphane at 0 °C with warming to room temperature to give 1,2,4-triazino[2,3-b]indazoles 12 by a domino-Staudinger/aza-Wittig/isomerization reaction. However, when heated to 80 °C the same reaction mixture affo
A novel synthesis of α-azidocinnamates, α-azido-α,β-unsaturated ketones and β-azidostyrenes mediated by cerium(IV) ammonium nitrate
Nair, Vijay,George, Tesmol G.
, p. 3199 - 3201 (2007/10/03)
Cerium(IV) ammonium nitrate mediated addition of azide to cinnamic esters, acids and α,β-unsaturated ketones, followed by reaction with sodium acetate afforded the α-azidocinnamates, β-azidostyrenes and α-azido-α,β- unsaturated ketones, respectively, in good yields. (C) 2000 Elsevier Science Ltd.
A VERSATILE SYNTHESIS OF VICINAL DIAZIDES USING HYPERVALENT IODINE
Moriarty, Robert M.,Khosrowshahi, Jaffar S.
, p. 2809 - 2812 (2007/10/02)
A convenient synthesis of vicinal diazides from olefins using C6H5IO/HOAc/NaN3 is described.A mechanism is proposed which accounts for the stereochemical outcome.
