A new preparation of substituted 4<i>H</i>-1-benzothiopyran-4-ones from c(α)<i>N</i>-benzoylhydrazones or c(α)<i>N</i>-carboalkoxyhydrazones and methyl thiosalicylate
作者:Kristen L. French、April J. Angel、Angela R. Williams、Douglas R. Hurst、Charles F. Beam
DOI:10.1002/jhet.5570350109
日期:1998.1
C(α)N-Benzoylhydrazones or C(α),N-carboalkoxyhydrazones were dilithiated with excess lithium diisopropylamide, and the dianion-type intermediates were condensed with lithiated methylthiosalicylate, followed by cyclization/hydrolysis to substituted4H-1-benzothiopyran-4-ones (thioflavones/thiochromones).
用过量的二异丙基氨基锂将C(α)N-苯甲酰肼或C(α)N-羰基烷氧基hydr酮二锂化,将二价阴离子型中间体与锂化的硫代水杨酸甲酯缩合,然后环化/水解成取代的4 H -1-苯并噻吩并- 4-one(硫代黄酮/硫代色酮)。