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Robust synthesis of NIR-emissive P-rhodamine fluorophores†
Maria Sauer,Veselin Nasufovic,Hans-Dieter Arndt,Ivan Vilotijevic
Organic & Biomolecular Chemistry Pub Date : 02/04/2020 00:00:00 , DOI:10.1039/D0OB00189A
Abstract

P-Rhodamines were accessed by implementing a robust three step sequence consisting of (i) addition of m-metallated anilines to dichlorophosphine oxides, (ii) selective dibromination, and (iii) cyclization of the diaryllithium reagents derived from the dibromides to form the dihydroacridophosphine core of P-rhodamines. A modified route was developed to produce non-symmetric P-rhodamines. A library of prepared P-rhodamines provides first insight into dependence of fluorophore properties on the structure of P-rhodamines. A P-rhodamine with highest batochromic shifts and quantum yields in the class was identified.

Graphical abstract: Robust synthesis of NIR-emissive P-rhodamine fluorophores
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