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
Gold(III)-Catalyzed Propargylic Substitution Reaction Followed by Cycloisomerization for Synthesis of Poly-Substituted Furans from N-Tosylpropargyl Amines with 1,3-Dicarbonyl Compounds
The treatment of N-tosylpropargyl amines 1 with 1,3-dicarbonylcompounds 2 in the presence of AuBr3 (5 mol%) and AgOTf (15 mol%) afforded poly-substituted furans 3 in good-to-high yields via the gold-catalyzed cleavage of the sp3 carbon–nitrogen bond.
作者:Lorenzo Zani、Silvia Alesi、Pier Giorgio Cozzi、Carsten Bolm
DOI:10.1021/jo052273o
日期:2006.2.1
[GRAPHICS]The treatment of various aromatic and aliphatic aldimines with a mixture of a terminal alkyne and a commercially available dimethylzinc solution in toluene yields the corresponding protected propargylic amines in moderate to excellent yields. The reaction proceeds in the absence of any activator. These observations led to the development of a three-component synthesis of propargylic amines in which the product was obtained upon mixing an aldehyde with ortho-methoxyaniline and phenylacetylene in the presence of dimethylzinc, through in situ formation of the corresponding imine.