Answers are grounded in this paper and cite their sources.
The synthesis of several hitherto unknown heterocyclic ring systems derived from thioflavone is described. Coupling of various o-haloheteroarenecarbonyl chlorides with phenylacetylene gives 1-(o-haloheteroaryl)-3-phenylprop-2-yn-1-ones, which were treated with NaSH in refluxing ethanol to yield the corresponding bi- and tricyclic annelated 2-phenylthiopyran-4-ones. Detailed NMR spectroscopic investigations of the ring systems and their precursors are presented.
No takes yet. Share an insight, caveat, or question.
Fuchs et al. (2009) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: