Synthesis of a visibly emissive 9-nitro-2,3-dihydro-1H-pyrimido[1,2-a]quinoxalin-5-amine scaffold with large stokes shift and live cell imaging
2015
Kanungo, Ajay | Patra, Dipendu | Mukherjee, Sanghamitra | Mahata, Tridib | Maulik, Prakas R. | Datta, Sañjaẏa
We have developed a novel fluorescent scaffold 4 which is a 9-nitro-2,3-dihydro-1H-pyrimido[1,2-a]quinoxalin-5-amine derivative from the reaction between di-tert-butyl but-2-ynedioate and a quinoxaline molecule containing a dimethyl amine side tail in high yield. The synthesis of scaffold 4 involves an sp³ C–N bond cleavage mechanism which is not very common. The scaffolds 4 is emissive in the visible range λₑₘ ∼ (517–540) nm with large stokes shifts (5005–6378) cm⁻¹ in ethanol. Laser confocal microscopy of the live HepG2 cells treated with compound 4f shows that it can be used for live cell imaging in nanomolar concentrations.
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