The Synthesis of Some New Fused and Substituted Chromenes

Abstract

Some new chromeno[2,3-b]pyrimidines, chromeno[3,2-c]pyridines, chromeno[2,3-b]pyridines and 3-chromenyl-1,3-thiazines were synthesized via the synthetic studies of the reaction of 2-imino-2H-chromen-3-thiocarboxamide with some aromatic aldehydes, active nitriles, and their ylidene derivatives.

Keywords:

• Chromenopyridines
• chromenothiazines
• malononitrile
• ylidenenitriles

Notes

^aUncorrected.

^bSatisfactory microanalyses, obtained: (C ± 0.30%; H ± 0.11%; N ± 0.35%; S ± 0.20%).

^cMeasured on Nicolet 710 FTIR spectrophotometer.

^dMeasured with Varian EM 360 L spectrometer at 400 MHz using TMS as internal standard.

*TFA used as a solvent for ¹H-NMR measurement.