Reaktionen冯Ø -halogenacetophenonen MIT schwefelkohlenstoff UND phenylisothiocyanat
摘要:
O-卤代苯乙酮1在氢化钠和烷基化试剂存在下与二硫化碳反应生成烯酮S,S-缩醛3和4。当反应在100°下进行时,可能形成1-硫代色酮5。分别用苯胺和胍处理3a分别得到乙烯酮N,N-乙缩醛6和2-氨基嘧啶7,将1与异硫氰酸苯酯/氢化钠反应并烷基化后得到乙烯酮S,N-乙缩醛9和噻唑烷酮14和噻唑烷15。环化9在碱性介质中形成图4(1H)-quinolones 11。合成的化合物的物理性质通过质量,1 H NMR和IR光谱进行表征。讨论了可能的形成方式。
Reaktionen von o-halogenacetophenonen mit schwefelkohlenstoff und phenylisothiocyanat
作者:W.-D. Rudorf、A. Schierhorn、M. Augustin
DOI:10.1016/0040-4020(79)80155-6
日期:1979.1
O-Haloacetophenones 1 react with carbon disulfide in the presence of sodium hydride and an alkylating reagent to ketene S,S-acetals 3 and 4. The formation of 1-thiochromones 5 is possible, when the reaction is carried out at 100°. Treatment of 3a with aniline and guanidine, respectively, leads to the ketene N,N-acetal 6 and the 2-aminopyrimidine 7, respectively Reaction of 1 with phenyl isothiocyanate/sodium
O-卤代苯乙酮1在氢化钠和烷基化试剂存在下与二硫化碳反应生成烯酮S,S-缩醛3和4。当反应在100°下进行时,可能形成1-硫代色酮5。分别用苯胺和胍处理3a分别得到乙烯酮N,N-乙缩醛6和2-氨基嘧啶7,将1与异硫氰酸苯酯/氢化钠反应并烷基化后得到乙烯酮S,N-乙缩醛9和噻唑烷酮14和噻唑烷15。环化9在碱性介质中形成图4(1H)-quinolones 11。合成的化合物的物理性质通过质量,1 H NMR和IR光谱进行表征。讨论了可能的形成方式。
Infrared spectra and theoretical study of the conformations of substituted benzoylketene-S,S-acetals
作者:A. Perjéssy、W. -D. Rudorf、D. Loos、Z. Šusteková
DOI:10.1007/bf00811088
日期:1994.12
The C=O stretching frequencies of substituted benzoylketene-S,S-dimethylacetals (1a-1o) and benzoylketene-S,S-ethyleneacetals (2a-2m) were measured in CHCl3 and CCl4 and correlated with the Hammett substituent constants. The correlations were split into two different and well separated lines for compounds containing electron donor and electron acceptor substituents, which were assigned to s-trans and s-cis quasiplanar conformations. The correlations of carbonyl stretching frequencies with C=O bond orders and oxygen atom charge densities calculated using the semiempirical AM1 method reveal similar results consistent with assignments of structures 1 and 2 to two quasiplanar conformations. The preparation of some new benzoylketene-S,S-acetals is reported as well.
Transition-metal-free solid phase synthesis of 1,2-disubstituted 4-quinolones via the regiospecific synthesis of enaminones
作者:Ajjampura C. Vinayaka、Toreshettahally R. Swaroop、Prasanna Kumara Chikkade、Kanchugarakoppal S. Rangappa、Maralinganadoddi P. Sadashiva
DOI:10.1039/c5ra21421a
日期:——
Herein, the transition-metal-free economical solidphasesynthesis of 1,2-disubstituted 4-quinolones has been developed via the novel regiospecific synthesis of enaminones. Notably, a wide range of enaminones were synthesized via a silica-supported solid-phase reaction in good to excellent yields. The transformation of enaminones to 1,2-disubstituted 4-quinolones and N-methyl-2-aryl-4-quinolone alkaloid