Gold-Catalyzed Addition of Carbon Nucleophiles to Propargyl Carboxylates
摘要:
Propargyl carboxylates react with 1,3-dicarbonyl compounds and electron-rich arenes in the presence of Au(l) catalysts to give enol carboxylates via alpha,beta-unsaturated Au(l) carbenes or Au(l)-coordinated allenes formed by 1,2- or 1,3-acyl migration, respectively.
Yb(OTf)3-catalyzed propargylation and allenylation of 1,3-dicarbonyl derivatives with propargylic alcohols: one-pot synthesis of multi-substituted furocoumarin
depending on the nature of propargylic alcohols. In addition, catalytic quantities of Yb(OTf)3 can also effectively promote the propargylation and allylation of 4-hydroxycoumarins at the 3-position. By applying this reaction as the key step, a multi-substituted furocoumarin can easily be synthesized in a one-pot procedure. The advantages of this method are broad scope, mild conditions, and easy handling
Brønsted Acid Catalyzed Propargylation of 1,3-Dicarbonyl Derivatives. Synthesis of Tetrasubstituted Furans
作者:Roberto Sanz、Delia Miguel、Alberto Martínez、Julia M. Álvarez-Gutiérrez、Félix Rodríguez
DOI:10.1021/ol0631298
日期:2007.2.1
Bronsted acids such as p-toluenesulfonic acid monohydrate (PTS) efficientlycatalyze a direct substitution of the hydroxyl group in propargylic alcohols with 1,3-dicarbonylcompounds. Selective propargylation or allenylation is obtained depending on the nature of the alkynol. Reactions can be performed in air in undried solvents with water being the only side product of the process. By applying this reaction
Condensation of propargylic alcohols with 1,3-dicarbonyl compounds and 4-hydroxycoumarins in ionic liquids (ILs)
作者:Gopalakrishnan Aridoss、Kenneth K. Laali
DOI:10.1016/j.tetlet.2011.10.021
日期:2011.12
Propargylicalcohols are activated toward 1,3-diketones by Lewis or Brønstedacidic ionic liquids (ILs) without an added catalyst, but significantly better conversions are achieved with metallic triflates [in particular Sc(OTf)3 and Ln(OTf)3] and bismuth nitrate in imidazolium ILs. The scope of this condensation reaction was investigated with a variety of propargylicalcohols and a host of acyclic
SnCl<sub>2</sub>-Catalyzed Propargylic Substitution of Propargylic Alcohols with Carbon and Nitrogen Nucleophiles
作者:Yoshiro Masuyama、Miki Hayashi、Noriyuki Suzuki
DOI:10.1002/ejoc.201201673
日期:2013.5
higher catalytic activity than tin(II) bromide or iodide in the propargylic substitution of 1-phenyl-2-propyn-1-ol with anisole at 40 °C in CH3NO2. The solubility of tin(II) fluoride in CH3NO2 would have to be extremely low to cause no propargylic substitution. 1-Phenyl-substituted propargylic alcohols readily reacted with all these nucleophiles, whereas 1-(4-cyanophenyl)-2-propyn-1-ol and 1-(pentafluo
一种弱路易斯酸,氯化锡 (II),对水和空气不敏感,可用作仲炔醇与碳亲核试剂(如富电子芳烃、杂芳烃和 1,3-二羰基)炔丙基取代的催化剂化合物和氮亲核试剂,如磺酰胺、氨基甲酸酯和甲酰胺,在 40-80 °C 的 CH3NO2 中,在空气中,在 1-苯基-2-炔丙基取代中表现出比溴化锡或碘化锡(II)更高的催化活性propyn-1-ol 和苯甲醚在 40 °C 的 中。氟化锡 (II) 在 中的溶解度必须极低才能不引起炔丙基取代。1-苯基取代的炔丙醇很容易与所有这些亲核试剂反应,而 1-(4-氰基苯基)-2-丙炔-1-醇和 1-(五氟苯基)-2-丙炔-1-醇根本不与1,2, 3-三甲氧基苯甚至在 中回流。1-烷基取代的仲炔醇,1,5-二苯基-1-戊炔-3-醇,经历了 SnCl2 催化的炔烃取代与富电子芳烃和酰胺,尽管即使在 80 °C 的
Sequential gold-catalyzed reactions of 1-phenylprop-2-yn-1-ol with 1,3-dicarbonyl compounds
A variety of sequential gold-catalyzedreactions of 1-phenylprop-2-yn-1-ol with 1,3-dicarbonylcompounds are directed towards different outcomes by a suitable choice of the catalytic system, feature of 1,3-dicarbonyl and reaction conditions.