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. Author manuscript; available in PMC: 2009 Sep 15.
Published in final edited form as: Tetrahedron Lett. 2007 May 7;48(19):3471–3474. doi: 10.1016/j.tetlet.2007.03.026

Scheme 4.

Scheme 4

DCDHF and DCDHF-V dyes functionalized with sulfonic acids. Reagents and conditions: (a) 1,3-propanesultone, reflux; (b) pyridine; (c) DMF, K2CO3, 2-(methylamino)ethanol, 130 °C; (d) NaH, DMF, 1,3-propanesultone; (e) pyridine, acetic acid.