26087-01-4Relevant articles and documents
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
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.
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
, 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.
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.