Palladium-Catalyzed Aerobic Anti-Markovnikov Oxidation of Aliphatic Alkenes to Terminal Acetals
作者:Saki Komori、Yoshiko Yamaguchi、Yasutaka Kataoka、Yasuyuki Ura
DOI:10.1021/acs.joc.8b02919
日期:2019.3.15
Terminal acetals were selectively synthesized from various unbiased aliphatic terminal alkenes and 1,2-, 1,3-, or 1,4-diols using a PdCl2(MeCN)2/CuCl catalyst system in the presence of p-toluquinone under 1 atm of O2 and mild reaction conditions. The slow addition of terminal alkenes suppressed the isomerization to internal alkenes successfully. Electron-deficient cyclic alkenes, such as p-toluquinone
在1 atm下在对甲苯醌存在下,使用PdCl 2(MeCN)2 / CuCl催化剂体系,由各种无偏的脂族末端烯烃和1,2-,1,3-或1,4-二醇选择性合成末端缩醛。O 2和温和的反应条件。末端烯烃的缓慢添加成功地抑制了异构化为内部烯烃。缺电子的环状烯烃,例如对甲苯醌,是增强催化活性和抗马尔科夫尼科夫选择性的关键添加剂。发现烯烃中的卤素基团起导向基团的作用,抑制了异构化并有效地提高了选择性。