enantioselective Negishi cross‐coupling reaction, and the first arylation of α‐halo esters with arylzinc halides, are disclosed. Employing a cobalt‐bisoxazoline catalyst, various α‐arylalkanoic esters were synthesized in excellent enantioselectivities and yields (up to 97 % ee and 98 % yield). A diverse range of functional groups, including ether, halide, thioether, silyl, amine, ester, acetal, amide, olefin
Directed Nickel-Catalyzed Negishi Cross Coupling of Alkyl Aziridines
作者:Daniel K. Nielsen、Chung-Yang (Dennis) Huang、Abigail G. Doyle
DOI:10.1021/ja4076716
日期:2013.9.11
Herein we report a nickel-catalyzed C-C bond-forming reaction between simple alkyl aziridines and organozinc reagents. This method represents the first catalytic cross-coupling reaction employing a nonallylic and nonbenzylic Csp(3)-N bond as an electrophile. Key to its success is the use of a new N-protecting group (cinsyl or Cn) bearing an electron-deficient olefin that directs oxidative addition
在这里,我们报告了简单的烷基氮丙啶和有机锌试剂之间的镍催化的 CC 键形成反应。这种方法代表了第一个采用非烯丙基和非苄基 Csp(3)-N 键作为亲电子试剂的催化交叉偶联反应。其成功的关键是使用带有缺电子烯烃的新 N 保护基团(cinsyl 或 Cn),该烯烃可指导氧化加成并促进还原消除。还介绍了与阐明交叉耦合机制有关的研究。
Cobalt-Catalyzed Electrophilic Amination of Arylzincs with<i>N</i>-Chloroamines
Roles reversed: An efficient cobalt‐catalyzed electrophilic amination of arylzinc reagents has been achieved. A variety of functionalized arylzincs and N‐chloroamines were coupled under mild conditions (see scheme). Both secondary and tertiary arylamines were obtained in moderate to excellent yields.
procedure for the synthesis of functionalized symmetricalbiaryl compounds is described. The reaction proceeds via the oxidative homocoupling of arylzinc species formed by cobalt catalysis in the presence of air or p-benzoquinone depending on the nature of the functional group. A novel procedure for the synthesis of functionalized symmetricalbiaryl compounds is described. The reaction proceeds via the
致力于纪念Jean F. Normant教授;杰出的科学家和伟大的人 抽象的 描述了合成官能化的对称联芳基化合物的新方法。根据官能团的性质,在空气或对苯醌存在下,通过钴催化形成的芳基锌物种的氧化均偶联反应进行。 描述了合成官能化的对称联芳基化合物的新方法。根据官能团的性质,在空气或对苯醌存在下,通过钴催化形成的芳基锌物种的氧化均偶联反应进行。