Multicomponent synthesis of 7-(diethylamino)coumarin-pyrrolo[3,4-b] pyridin-5-one conjugates and modulation of their twisted intramolecular charge transfer (TICT) processes

被引：1

作者：

Flores-Reyes, Julio C. ^{[1
]}

Valderrama-Celestino, Alejandro ^{[1
]}

Trejo-Velasco, Maria F. ^{[1
]}

Jaramillo-Marquez, Karla I. ^{[1
]}

Gonzalez, Federico ^{[2
]}

Rojas-Hernandez, Alberto ^{[1
]}

Galano, Annia ^{[1
]}

Islas-Jacome, Alejandro ^{[1
]}

Gonzalez-Zamora, Eduardo ^{[1
]}

机构：

[1] Univ Autonoma Metropolitana Iztapalapa, Dept Quim, Ave Ferrocarril San Rafael Atlixco 186,Col Leyes R, Mexico City 09310, Mexico

[2] Univ Autonoma Metropolitana Iztapalapa, Dept Ingn Proc Hidraul, Ave Ferrocarril San Rafael Atlixco 186,Col Leyes R, Mexico City 09310, Mexico

来源：

TETRAHEDRON | 2024年 / 168卷

关键词：

Multicomponent reaction; Polyheterocycle; Coumarin; pyrrolo[3,4-b]pyridin-5-one; TICT; AGGREGATION-INDUCED EMISSION; COUMARIN DERIVATIVES; FLUORESCENCE; DYE; DESIGN;

D O I：

10.1016/j.tet.2024.134335

中图分类号：

O62 [有机化学];

学科分类号：

070303 ; 081704 ;

摘要：

By coupling an Ugi-Zhu three-component reaction to a cascade sequence (aza Diels-Alder cycloaddition/Nacylation/decarboxylation/dehydration) into a one-pot process, seven new 7-(diethylamino)coumarin-pyrrolo [3,4-b]pyridin-5-one bis-heterocyclic conjugates were synthesized in moderate overall yields (15-38 %). Next, the photophysical properties of all products were determined using UV-Vis and fluorescence spectroscopy. These products exhibited fluorescence quantum yields (FQY) ranging from 17 % to 25 %. In contrast, one of their precursors, the free 7-(diethylamino)-3-carbaldehyde displayed a low FQY of 2 %, and, also exhibited dual emission across all solvents used for the measurements. The increase in quantum yield observed upon incorporation of the coumarin moiety into MCR products was attributed to the inhibition of the twisted intramolecular charge transfer (TICT) process. This one naturally occurs in the free coumarin but was suppressed in the products due to a decrease in the acceptor strength of the substituent at position 3 of the coumarin moiety. Furthermore, the electronic structure of the compounds was computed by DFT/TD-DFT calculations allowing to determine which molecular orbitals (MO) were involved in the electronic transitions.

引用

页数：10

共 36 条

[1] Unusual Aggregation-Induced Emission of a Coumarin Derivative as a Result of the Restriction of an Intramolecular Twisting Motion [J].