biostudies-literatureOrrego-Hernandez JFacultad de Ciencias, Universidad de los AndesDepartamento Administrativo de Ciencia, Tecnología e Innovación27318-27323https://www.ebi.ac.uk/biostudies/studies/S-EPMC9070601biostudies-literatureUnknown9(47)A green process to access pyrazolo-fused 4-azafluorenones (indeno[1,2-b]pyrazolo[4,3-e]pyridines, IPP) 4a-xvia the three-component reaction between indan-1,3-dione (1), benzaldehydes 2 and 5-amino-1-arylpyrazoles 3 is described. These compounds were successfully used as precursors of the novel dicyanovinylidene derivatives 7a-d containing different acceptor (A) or donor (D) aryl groups at position 4 of its fused system. The structures of products obtained (4a-x and 7a-d) were determined based on NMR experiments, HRMS analysis, and X-ray diffraction studies for 7b. The photophysical and computational studies of 7a-d showed that these products are modulable ICT fluorophores, even some preliminary tests revealed that these compounds could be used as fluorescent chemodosimRSC advancesPyrazolo-fused 4-azafluorenones as key reagents for the synthesis of fluorescent dicyanovinylidene-substituted derivatives.PMC9070601Project Code 120465843502Orrego-Hernandez JLizarazo CPortilla JCobo JfalsePyrazolo-fused 4-azafluorenones as key reagents for the synthesis of fluorescent dicyanovinylidene-substituted derivatives.A green process to access pyrazolo-fused 4-azafluorenones (indeno[1,2-b]pyrazolo[4,3-e]pyridines, IPP) 4a-xvia the three-component reaction between indan-1,3-dione (1), benzaldehydes 2 and 5-amino-1-arylpyrazoles 3 is described. These compounds were successfully used as precursors of the novel dicyanovinylidene derivatives 7a-d containing different acceptor (A) or donor (D) aryl groups at position 4 of its fused system. The structures of products obtained (4a-x and 7a-d) were determined based on NMR experiments, HRMS analysis, and X-ray diffraction studies for 7b. The photophysical and computational studies of 7a-d showed that these products are modulable ICT fluorophores, even some preliminary tests revealed that these compounds could be used as fluorescent chemodosim2019-01-01T00:00:00Z2019 Aug2025-04-04T09:10:17.774Z2025-04-04T09:10:17.774ZS-EPMC90706013552917910.1039/c9ra04682h