A Convenient Synthesis of 3,3-Bis(thienyl)propionic Acids by Platinum (II)-Catalyzed Reaction of Thiophenes with Propiolic Acids
作者:Tsugio Kitamura、Tomonobu Mizuhara、Mory Laye Keita、Juzo Oyamada
DOI:10.1080/10426501003773514
日期:2010.5.27
Platinum(II)-catalyzed hydroarylation of propiolic acids was applied to thiophenes, and we found that the reaction with thiophenes predominantly afforded double thienylated products. Reaction of thiophenes with ethyl propiolate proceeded efficiently in the presence of K2PtCl4 (2 mol%) and AgOTf (8 mol%) in trifluoroacetic acid under mild conditions to give ethyl 3,3-bis(substituted thienyl)propionates
将铂 (II) 催化的丙炔酸加氢芳基化应用于噻吩,我们发现与噻吩的反应主要提供双噻吩化产物。在三氟乙酸中存在 K2PtCl4(2 mol%)和 AgOTf(8 mol%)的条件下,噻吩与丙炔酸乙酯的反应在温和条件下有效进行,以良好的产率得到 3,3-双(取代噻吩基)丙酸乙酯。与丙炔酸而不是乙酯的相同铂(II)催化反应以高产率提供双(取代噻吩基)丙酸。