Palladium-Catalyzed Synthesis of (<i>Z</i>)-3-Arylthioacrylic Acids and Thiochromenones
作者:Thiruvengadam Palani、Kyungho Park、Kwang Ho Song、Sunwoo Lee
DOI:10.1002/adsc.201201106
日期:2013.4.15
reaction of aryl halides, sodium sulfide pentahydrate (Na2S⋅5 H2O), and propiolic acid in the presence of 2.5% bis(triphenylphosphine)palladium chloride [Pd(PPh3)2Cl2], 5% 1,4‐bis(diphenylphosphino)butane (dppb) and 2 equivalents of 1,8‐diazabicycloundec‐7‐ene (DBU) produces stereoselectively (Z)‐3‐arylthioacrylic acids in good yields. A study of the reaction pathway suggested that the CS bond formation
芳基卤化物,硫化钠五水合物(Na组成的三组分反应2 S⋅5ħ 2 O),并在2.5%的双(三苯基膦)氯化钯的存在下丙炔酸[的Pd(PPh 3)2氯2 ],5 %1,4-双(二苯基膦基)丁烷(dppb)和2当量的1,8-二氮杂双环十一碳烯7-烯(DBU)以高收率选择性产生立体选择性(Z)-3-芳硫基丙烯酸。反应途径的研究表明,在C 芳基卤化物和Na之间S键形成2 S⋅5ħ 2首先进行O,并使所得的中间体与丙酸反应以产生所需的产物。另外,当用酸处理所得产物时,以良好的产率形成了相应的硫代色酮。