1335439-90-1Relevant articles and documents
2-Aminoquinazolines by Chan-Evans-Lam Coupling of Guanidines with (2-Formylphenyl)boronic Acids
Solomin, Vitalii V.,Seins, Alberts,Jirgensons, Aigars
, p. 1507 - 1510 (2020)
A new method is presented for the synthesis of 2-aminoquinazolines, which is based on a Chan-Evans-Lam coupling of (2-formylphenyl)boronic acids with guanidines. Relatively mild conditions involving the use of inexpensive CuI as a catalyst and methanol as a solvent permit the application of the method to a wide range of substrates. Nonsubstituted, N-monosubstituted, and N,N-disubstituted guanidines can be used as reactants to give the corresponding 2-aminoquinazolines in moderate yields from readily available (2-formylphenyl)boronic acids.
Unprecedented intramolecular [3 + 2] cycloadditions of azido-ketenimines and azido-carbodiimides. Synthesis of indolo[1,2-a]quinazolines and tetrazolo[5,1-b]quinazolines
Alajarin, Mateo,Bonillo, Baltasar,Ortin, Maria-Mar,Orenes, Raul-Angel,Vidal, Angel
, p. 6741 - 6749 (2011/11/05)
N-(2-Azidomethyl)phenyl ketenimines and N-(2-azidomethyl)phenyl-N′- alkyl(aryl) carbodiimides undergo, under mild thermal conditions, intramolecular [3 + 2] cycloaddition reactions between the azido group and either the CC or the distal CN double bonds of the ketenimine and carbodiimide functions respectively. The reaction products are indolo[1,2-a]quinazolines and/or indolo[2,1-b]quinazolines in the case of azido-ketenimines, and tetrazolo[5,1-b]quinazolines in the case of azido-carbodiimides. The formation of the two classes of indoloquinazolines implies the ulterior dinitrogen extrusion from the non-isolated, putative [3 + 2] cycloadducts between the azide and ketenimine functions, whereas in the case of azido-carbodiimides the initial cycloadducts, tetrazoloquinazolines, were cleanly isolated and further converted into 2-aminoquinazolines by thermally induced dinitrogen extrusion.