Nickel-Catalyzed Regioselective Reductive Cross-Coupling of Aryl Halides with Polysubstituted Allyl Halides in the Presence of Imidazolium Salts
作者:Hongjun Ren、Zhan Zhang、Lijun Xu、Zhengkai Chen、Zhubo Liu、Maozhong Miao、Jinyu Song
DOI:10.1055/s-0035-1560531
日期:——
The nickel-catalyzed direct reductive cross-coupling of aryl halides with readily accessible polysubstituted allyl halides provides an efficient method for preparing diverse allylated arenes under mild conditions. Both allyl bromides and allyl chlorides are compatible with the transformation.
Improvements and Applications of the Transition Metal-Free Asymmetric Allylic Alkylation using Grignard Reagents and Magnesium Alanates
作者:David Grassi、Alexandre Alexakis
DOI:10.1002/adsc.201500495
日期:2015.10.12
Two new N-heterocyclic carbene (NHC) ligands have been synthesized and employed in the transition metal-free asymmetric allylic alkylation (AAA) mediated by Grignardreagents and magnesium alanates. The employment of these ligands showed high yields and improved regio- and enantioselectivity in the formation of tertiary and quaternary stereocenters. Moreover, the low catalyst loading (up to 0.3 mol%)
Palladium-Catalyzed Completely Linear-Selective Negishi Cross-Coupling of Allylzinc Halides with Aryl and Vinyl Electrophiles
作者:Yang Yang、Thomas J. L. Mustard、Paul Ha-Yeon Cheong、Stephen L. Buchwald
DOI:10.1002/anie.201308585
日期:2013.12.23
Completely linear: The title reaction provides an effective means to access a wide range of prenylated arenes and “skipped dienes” in a completely linear‐selective fashion, as demonstrated by a concise synthesis of the anti‐HIV natural product siamenol. DFT calculations shed light on the origin of the excellent regioselectivity observed with the current Pd‐based catalyst system.
完全线性:标题反应提供了一种有效的方法,可以以完全线性选择性的方式获得广泛的异戊二烯化芳烃和“跳过的二烯”,如抗 HIV 天然产物 siamenol 的简明合成所证明的那样。DFT 计算揭示了当前 Pd 基催化剂体系观察到的优异区域选择性的起源。