Palladium(II) and palladium(0)-cocatalyzed ring opening and oxidation reactions of 2-(arylmethylene)cyclopropylcarbinols
作者:Min Shi、Guo-Qiang Tian、Jia Li
DOI:10.1016/j.tet.2009.02.028
日期:2009.4
In the presence of Pd(II) acetate and triethylamine as well as triphenylphosphine, 2-(arylmethylene)cyclopropylcarbinols 1 underwent ring opening and oxidation reactions smoothly to deliver (2E,4E)-5-arylpenta-2,4-dienals 2 in toluene at 60 °C in moderate to good yields under ambient atmosphere. Mechanisms involved with an in situ generated Pd(0) species from Pd(II) and Et3N or PPh3 catalyzed isomerization
在乙酸钯(II)和三乙胺以及三苯基膦的存在下,对2-(芳基亚甲基)环丙基甲醇1进行开环和平滑的氧化反应,以生成(2 E,4 E)-5-芳基戊2,4-二烯醛2在室温下于60°C的甲苯中以中等至良好的收率收率。与Pd(II)和Et 3 N或PPh 3的原位生成Pd(0)物种有关的机制催化1的异构化以提供(E,E)-5-芳基戊2,4-二烯-1-醇3并经Pd(II)催化的3的好氧氧化 已经在对照和氘标记实验的基础上提出了建议。