26825-35-4Relevant articles and documents
2,5-Bis(azulenyl)pyrrolo[3,2-b]pyrroles-the key influence of the linkage position on the linear and nonlinear optical properties
Poronik, Yevgen M.,Mazur, Leszek M.,Samo?, Marek,Jacquemin, Denis,Gryko, Daniel T.
, p. 2620 - 2628 (2017/03/17)
The first route towards pyrrolo[3,2-b]pyrroles containing two azulene moieties at positions 2 and 5 was developed. The key step of this approach is the three-step transformation of pyridine scaffolds into azulene via sequential N-arylation followed by ring-opening and a reaction with cyclopentadiene. The resulting quadrupolar acceptor-donor-acceptor compounds possess interesting optical properties such as bathochromically shifted absorption with the magnitude of the red-shift strongly dependent on the linkage position. Two-photon absorption of these functional dyes is markedly different from that of previously described pyrrolo[3,2-b]pyrroles. The experimental optical spectra were rationalized using time-dependent density functional theory calculations of both the linear and nonlinear optical properties.
4-N-aryl(benzyl)amino-4-hetaryl-1-butenes as building blocks in heterocyclic synthesis. 1. New route to 4,6-dimethyl-2-pyridylquinolines from the 4-N-p-methylphenylamino-4-pyridyl-1-butenes
Vargas Mendez, Leonor Y.,Kouznetsov, Vladimir,Stashenko, Elena,Bahsas, Al,Amaro-Luis, Juan
, p. 323 - 326 (2007/10/03)
Mediated-acid intramolecular cyclisation of 4-N-p-methylphenylamino-4-pyridyl-1-butenes 4-6 was used to obtain new C-2 pyridyl substituted 4,6-dimethyl-1,2,3,4-tetrahydroquinolines 7-9, which were oxidised then to their aromatic analogues 10-12 in good yi
