136341-16-7Relevant academic research and scientific papers
Synthesis of tricyclic quinolones and naphthyridones by intramolecular heck cyclization of functionalized electron-rich heterocycles
Beccalli, Egle M.,Broggini, Gianluigi,Martinelli, Michela,Paladino, Giuseppe,Zoni, Caterina
, p. 2091 - 2096 (2007/10/03)
Starting from commercially available pyrrole- and thiophene-2-carboxylic acids 1 or thiophene- and furan-3-carboxylic acids 6, we report the synthesis of tricyclic fused quinolone and naphthyridone derivatives, in only three steps, by an intramolecular He
ELCTRON IMPACT MASS SPECTRA OF SOME 2',3'-, AND 4'-SUBSTITUTED THIOPHENE-2- AND 3-CARBOXANILIDES
Barbieri, Cristina Lea,Ceraulo, Leopoldo,Maria, Paolo De,Fontana, Antonella,Spinelli, Domenico,Zuppiroli, Luca
, p. 975 - 984 (2007/10/02)
The electron impact mass spectra (EI/MS) of 2- and 3-carboxanilides are dominated by the peak due to the corresponding thenoyl cations formed by cleavage of the C-N amide bond.This reaction is not affected by the polar effect of the substituents present in the phenyl ring.Most of the 2'-substituted derivatives undergo a cyclisation reaction with ejection of the substituent.In addition, for 2'-methyl and 2'-ethyl derivatives of both series of thiophene anilides a cryptic "ortho"-effect was suggested as responsible of the charge retention in the aniline moiety.
