Stereoselective, solvent free, highly efficient synthesis of aldo- and keto-N-acylhydrazones applying grindstone chemistry
作者:José Maurício dos Santos Filho、Savio Moita Pinheiro
DOI:10.1039/c7gc00730b
日期:——
A mild and efficientsynthesis of N-acylhydrazones has been developed, applying a simple grindstone procedure, leading to a library of 51 examples exhibiting a broad variety of structural features, 21 of them described for the first time in this paper. This methodology works without any organic solvent under the catalysis of acetic acid at room temperature, promotes the formation of essentially pure
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)。