Nickel-Catalyzed Regioselective C(2)−H Difluoroalkylation of Indoles with Difluoroalkyl Bromides
作者:Vineeta Soni、Dipesh M. Sharma、Benudhar Punji
DOI:10.1002/asia.201800504
日期:2018.9.4
RegioselectiveC(2)−Hdifluoroalkylation of C‐3 unsubstituted indoles with commonly available fluoroalkyl bromides is successfully achieved employing a simple nickel catalyst system, (DME)NiCl2/Xantphos. This methodology shows excellent regioselectivity and exhibits a broad substrate scope. Various functional groups, such as ‐OMe, ‐F, and ‐Br, are tolerated on the indole backbone to give the difluoroalkylated
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Direct C3 Alkylation of Indoles and Oxindoles
作者:Shyam Basak、Ana Alvarez-Montoya、Laura Winfrey、Rebecca L. Melen、Louis C. Morrill、Alexander P. Pulis
DOI:10.1021/acscatal.0c01141
日期:2020.4.17
The direct C3 alkylation of indoles and oxindoles is a challenging transformation, and only a few direct methods exist. Utilizing the underexplored ability of triaryl boranes to mediate the heterolytic cleavage of α-nitrogen C–H bonds in amines, we have developed a catalytic approach for the direct C3 alkylation of a wide range of indoles and oxindoles using amine-based alkylating agents. We also employed
Selective Ruthenium-Catalyzed N-Alkylation of Indoles by Using Alcohols
作者:Sebastian Bähn、Sebastian Imm、Kathleen Mevius、Lorenz Neubert、Annegret Tillack、Jonathan M. J. Williams、Matthias Beller
DOI:10.1002/chem.200903144
日期:2010.3.22
Alcohols for alkylation! The first homogeneous‐catalyzed N‐alkylations of indoles with aliphatic alcohols proceed under transfer hydrogenation conditions. By the use of the Shvo catalyst and p‐toluenesulfonic acid (PTSA) this atom‐efficient reaction occurs highly selectively with water formed as the only byproduct (see scheme).