copper-catalyzed coupling reaction of 2-pyridinesulfonates with Grignardreagents revealed that reactions with catalytic Cu(OTf)2 were completed in <40 min. The results differed from those of the previous CuI-catalyzed reactions of tosylates in the presence of additives (LiOMe and TMEDA) for 12–24 h. It was shown that the preferred coordination of the leaving group to the reagents accelerated the reaction
Copper-Catalyzed Cross-Coupling of Nonactivated Secondary Alkyl Halides and Tosylates with Secondary Alkyl Grignard Reagents
作者:Chu-Ting Yang、Zhen-Qi Zhang、Jun Liang、Jing-Hui Liu、Xiao-Yu Lu、Huan-Huan Chen、Lei Liu
DOI:10.1021/ja304848n
日期:2012.7.11
Practical catalytic cross-coupling of secondary alkyl electrophiles with secondary alkyl nucleophiles under Cu catalysis has been realized. The use of TMEDA and LiOMe is critical for the success of the reaction. This cross-coupling reaction occurs via an S(N)2 mechanism with inversion of configuration and therefore provides a general approach for the stereocontrolled formation of C-C bonds between
已经实现了在铜催化下仲烷基亲电试剂与仲烷基亲核试剂的实际催化交叉偶联。TMEDA 和 LiOMe 的使用对于反应的成功至关重要。这种交叉偶联反应通过构型反转的 S(N)2 机制发生,因此为手性仲醇的两个叔碳之间立体控制形成 CC 键提供了通用方法。
Cu(II) Porphyrin-catalyzed Coupling of Alkyl Tosylates and Grignard Reagents
Copper(II) porphyrin-catalyzed coupling of alkyl tosylates and alkyl Grignard reagents afforded substituted alkanes. The role of the copper(II) porphyrin complex was examined using EPR and in-situ ...
铜 (II) 卟啉催化的甲苯磺酸烷基酯和烷基格氏试剂的偶联得到取代的烷烃。使用 EPR 和原位...
C(sp3)–C(sp3) Coupling of Cycloalkanes and Alkyl Halides via Dual Photocatalytic Hydrogen Atom Transfer and Nickel Catalysis
作者:Ramadevi Pilli、Keerthika Selvam、Bala S. S. Balamurugan、Vidya Jose、Ramesh Rasappan
DOI:10.1021/acs.orglett.4c00567
日期:2024.4.19
Functionalization of C(sp3)–H bonds represents the most straightforward and atom-economical transformation in organic synthesis. An innovative approach integrating photocatalytic hydrogen atom transfer (HAT) and transition metal catalysis has made significant progress in the coupling of α-heterosubstituted C–H bonds with alkyl halides. However, unactivated alkanes were ineffective as a result of the
C(sp 3 )–H 键的官能化代表了有机合成中最直接且最经济的转化。结合光催化氢原子转移(HAT)和过渡金属催化的创新方法在α-杂取代C-H键与卤代烷的偶联方面取得了重大进展。然而,由于大量副产物的形成,未活化的烷烃是无效的。在此,我们证明了环烷烃和苄基溴/伯烷基碘偶联中的直接 HAT 和镍催化作用。此外,十钨酸四丁基铵(TBADT)也被回收和再利用。
Metal-promoted cyclization. 28. Regioselective and diastereoselective alkyl-alkene and alkene-alkene coupling promoted by zirconocene and hafnocene
作者:Douglas R. Swanson、Christophe J. Rousset、Eiichi Negishi、Tamotsu Takahashi、Takashi Seki、Masahiro Saburi、Yasuzo Uchida