Halochromic Molecules. Synthesis of Substituted 6H-Chromenoindolizines and their Aza-analogues
We have synthesized a series of substituted chromenoindolizines and their respective aza-analogues.Dyes generated from them contain the electrondonating 2-(2-hydroxy-5-methylphenyl)indolizin-3-yl moiety.The 90 MHz FT 1H-NMR spectra of starting and final products supported the postulated structures.Fragmentations in the mass spectra also were consistent with the assumed structures.
The invention relates to chromenoazaindolizines of the general formula STR1 wherein each of Y, X1 and X2 independently of the other is hydrogen, halogen, lower alkyl, lower alkanoylamino or a group of the formula STR2 each of R1
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(2008/06/13)
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