报道了铜催化下 α,β-不饱和砜的不同官能化。使用铜催化剂、磷酸烯丙酯、双(频哪醇)二硼和LiOMe实现了烯基砜的非对映选择性硼基化烯丙基化。在该方法中,将铜-硼基络合物添加到烯基砜中并随后进行烯丙基取代,使得硼烯丙基化产物具有良好的产率和优异的顺式非对映选择性。相反,更强的碱(KO t -Bu)通过消除磺酰基和硼基基团,进一步促进反应形成( E )-跳过的二烯。
dimethylphenylsilylmethylmagnesium chloride result in highly regioselective dehydrohalogenation. The reaction does not follow the conventional E2 elimination mechanism but includes beta-hydride elimination from the corresponding alkylcobalt intermediate. The interesting reaction mechanism of the cobalt-catalyzed dehydrohalogenation offered unique transformations that are otherwise difficult to attain.
Highly Efficient Allyl Cross-Coupling Reactions of Allylindiums with Organic Electrophiles
作者:Kooyeon Lee、Jinsung Lee、Phil Ho Lee
DOI:10.1021/jo026121u
日期:2002.11.1
This paper describes highly efficient allyl cross-coupling reactions of allylindiums with organic electrophiles such as aryl and vinyl triflates, vinyl halides, dibromoolefin, and alkynyl iodide. The reactions were carried out using 4 mol % Pd(PPh3)4 in the presence of 3 equiv of LiCl in DMF at 100 degrees C under a nitrogen atmosphere. Allylindium, generated from the reaction of 1 equiv of indium