Journal of Heterocyclic Chemistry p. 45 - 48 (1998)
Update date:2022-08-03
Topics: Preparation Experimental terms
French, Kristen L.
Angel, April J.
Williams, Angela R.
Hurst, Douglas R.
Beam, Charles F.
C(α),N-Benzoylhydrazones or C(α),N-carboalkoxyhydrazones were dilithiated with excess lithium diisopropylamide, and the dianion-type intermediates were condensed with lithiated methyl thiosalicylate, followed by cyclization/hydrolysis to substituted 4H-1-benzothiopyran-4-ones (thioflavones/thiochromones).
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