Zinc-Mediated Synthesis of Tertiary Alkyl Selenides from Tertiary Alkyl Halides
作者:Alain Krief、Michel Derock、Damien Lacroix
DOI:10.1055/s-2005-918933
日期:——
Diorganyl selenides are efficiently synthesized from tertiaryalkyl halides, selenols or selenolates and zinc dibromide as well as from diselenides in the presence of zinc.
It takes two to tango: synthesis of cytotoxic quinones containing two redox active centers with potential antitumor activity
作者:Daisy J. B. Lima、Renata G. Almeida、Guilherme A. M. Jardim、Breno P. A. Barbosa、Augusto C. C. Santos、Wagner O. Valença、Marcos R. Scheide、Claudia C. Gatto、Guilherme G. C. de Carvalho、Pedro M. S. Costa、Claudia Pessoa、Cynthia L. M. Pereira、Claus Jacob、Antonio L. Braga、Eufrânio N. da Silva Júnior
DOI:10.1039/d1md00168j
日期:——
We report the synthesis of 47 new quinone-based derivativesvia click chemistry and their subsequent evaluation against cancer cell lines and the control L929 murine fibroblast cell line. These compounds combine two redox centers, such as an ortho-quinone/para-quinone or quinones/selenium with the 1,2,3-triazole nucleus. Several of these compounds present IC50 values below 0.5 μM in cancer cell lines
Synthesis of diselenides and selenides from elemental selenium
作者:Alain Krief、Michel Derock
DOI:10.1016/s0040-4039(02)00277-0
日期:2002.4
Sodium hydride is able to reduce elemental selenium to sodium diselenide (Na2Se2), but not to sodium selenide (Na2Se). Dialkyl diselenides and even dialkyl selenides, including unsymmetrical dialkyl selenides, can be nevertheless synthesized using the proper Se/NaH ratio (1/1 or 1/2).
氢化钠能够将元素硒还原为二硒化钠(Na 2 Se 2),但不能还原为硒化钠(Na 2 Se)。尽管如此,仍可以使用适当的Se / NaH比(1/1或1/2)合成二烷基二硒化物,甚至二烷基硒化物,包括不对称的二烷基硒化物。
Conditions-Driven Selective Synthesis of Selenides and Selenols from Elemental Selenium
Sodium borohydride in DMF is able to reduce elemental selenium in the presence of ethanol. Alkylation of the species resulting from the reaction of 2:1 molar equivalents of NaBH4/Se allows the selective synthesis, under very mild conditions, of symmetrical dialkyl selenides. Addition of formic acid, prior to that of the electrophile, permits the synthesis of the corresponding selenols.
Selenocyanation using a combined reagent of triphenylphosphine and selenocyanogen. A new and simple synthesis of alkyl selenocyanates and symmetrical alkyl diselenides from alcohols
作者:Y. Tamura、M. Adachi、T. Kawasaki、Y. Kita
DOI:10.1016/s0040-4039(01)93689-5
日期:1979.1
tri-phenylphosphine to selenocyanogen solution in methylene chloride and tetrahydrofuran reacts below −60° with primaryalcohols to produce directly the corresponding alkyl selenocyanates and alkyl diselenides in good yields. With secondaryalcohols mixtures of selenocyanates and isoselenocyanates are obtained, while tertiary alcohols fail to react with the reagent.