polymer-incarcerated (PI) Pdcatalyst bearing an active phosphine ligand has been developed. This catalyst was prepared easily according to a conventional PI method (microencapsulation and cross-linking of polymer chains), and TEM images of PI Pd showed the formation of small Pd clusters dispersed on the polymer support without formation of Pd aggregates. The catalyst showed high activity in amination reactions of
已经开发出一种带有活性膦配体的新型聚合物包埋 (PI) Pd 催化剂。根据传统的 PI 方法(聚合物链的微囊化和交联),该催化剂很容易制备,PI Pd 的 TEM 图像显示形成分散在聚合物载体上的小 Pd 簇,而没有形成 Pd 聚集体。该催化剂在各种芳基氯与胺的胺化反应中表现出高活性。反应在不添加任何外部膦配体的情况下进行,通过简单过滤定量回收催化剂,并在不损失活性的情况下重复使用至少3次。
Iridium-Catalyzed Highly Efficient and Site-Selective Deoxygenation of Alcohols
作者:Shiyi Yang、Weiping Tang、Zhanhui Yang、Jiaxi Xu
DOI:10.1021/acscatal.8b02495
日期:2018.10.5
An iridium-catalyzed, highly efficient, and site-selective deoxygenation of primary, secondary, and tertiary alcohols has been realized, under the assistance of a 4-(N-substituted amino)aryl directing group. Only the hydroxyl adjacent to the directing group can be deoxygenated. The deoxygenation is performed in water, with formic acid as both the promoter and hydride donor. Excellent yields and functionality
N-alkylation of amines by using secondary amides as the alkyl source was developed. A versatile type of carboxamide functioned as an N-alkylation reagent in the presence of an indium(III) catalyst and a hydrosilane to provide alkylated tertiary aminesefficiently. This amide-based catalytic N-alkylation strategy is considered to be a highly useful protocol to access unsymmetrical tertiary amines.
The oxidative direct cyclizaion of N-methylanilines with electron-deficientalkenes involving maleimides and benzylidene malononitriles through sp3 and sp2 C–H bond cleavage proceeds effectively under a CuCl2/O2 catalysis to provide the corresponding tetrahydroquinolines in good yields.
在CuCl 2 / O 2催化下,N-甲基苯胺与电子不足的烯烃(包括马来酰亚胺和亚苄基丙二腈)通过sp 3和sp 2的C-H键裂解的直接氧化环化反应可有效地提供相应的四氢喹啉,并具有良好的收率。
Amination of Aryl Alcohol Derivatives
申请人:Garg Neil K.
公开号:US20130289270A1
公开(公告)日:2013-10-31
Embodiments of the invention provide methods and materials for chemical cross-coupling reactions that utilize aryl alcohol derivatives as cross-coupling partners. Embodiments of the invention include methods for the amination of aryl sulfamates and carbamates, which are attractive cross-coupling partners, particularly for use in multistep synthesis. Illustrative embodiments include versatile means to use simple derivatives of phenol as precursors to polysubstituted aryl amines, as exemplified by a concise synthesis of the antibacterial drug linezolid.