Nickel-Catalyzed Direct Addition of Diorganozinc Reagents to Phthalimides: Selective Formation of Gamma-Hydroxylactams
摘要:
The nickel-catalyzed addition of diorganozinc reagents to phthalimides proceeds with excellent selectivity to provide 3-substituted-3-hydroxyisoindolin-1-one products. These 3-hydroxy--lactams are produced cleanly in high yield with numerous examples of imide substitution and a broad range of diorganozinc reagents that are prepared and utilized without purification.
Alkyl−(Hetero)Aryl Bond Formation via Decarboxylative Cross-Coupling: A Systematic Analysis
作者:Frederik Sandfort、Matthew J. O'Neill、Josep Cornella、Laurin Wimmer、Phil S. Baran
DOI:10.1002/anie.201612314
日期:2017.3.13
useful surrogates for alkylhalides in cross‐coupling chemistry. Such esters are easily accessible through reactions between ubiquitous carboxylic acids and coupling agents widely used in amide bond formation. This article features an amalgamation of in‐house experience bolstered by approximately 200 systematically designed experiments to accelerate the selection of ideal reaction conditions and activating
Iron-Catalyzed Difluoromethylation of Arylzincs with Difluoromethyl 2-Pyridyl Sulfone
作者:Wenjun Miao、Yanchuan Zhao、Chuanfa Ni、Bing Gao、Wei Zhang、Jinbo Hu
DOI:10.1021/jacs.7b11976
日期:2018.1.24
We report the first iron-catalyzed difluoromethylation of arylzincs with difluoromethyl2-pyridylsulfone via selective C-S bond cleavage. This method employs the readily available, bench-stable fluoroalkyl sulfone reagent and inexpensive iron catalyst, allowing facile access to structurally diverse difluoromethylated arenes at low temperatures. The experiment employing a radical clock indicates the
Highly Stereoselective Cobalt-Catalyzed Allylation of Functionalized Diarylzinc Reagents
作者:Paul Knochel、Guillaume Dunet
DOI:10.1055/s-2007-980344
日期:2007.6
Functionalized diarylzinc reagents react readily with allylic chlorides or phosphates in the presence of Co(acac)2 (10 mol%) to give the SN2 products in high yields and with retention of the double-bond configuration. Functionalities like ester, ketone, or cyano are tolerated.
作者:Fumihiko Toriyama、Josep Cornella、Laurin Wimmer、Tie-Gen Chen、Darryl D. Dixon、Gardner Creech、Phil S. Baran
DOI:10.1021/jacs.6b07172
日期:2016.9.7
single electron transfer using Ni and Fe catalyst systems have been studied extensively, and separately, for decades. Here we demonstrate the first couplings of redox-active esters (both isolated and derived in situ from carboxylic acids) with organozinc and organomagnesium species using an Fe-based catalyst system originally developed for alkyl halides. This work is placed in context by showing a direct
几十年来,基于单电子转移使用 Ni 和 Fe 催化剂体系的烷基卤化物和有机金属物种的交叉偶联已被广泛且分别地研究。在这里,我们展示了氧化还原活性酯(从羧酸中分离和原位衍生)与有机锌和有机镁物种的首次偶联,使用最初为烷基卤化物开发的 Fe 基催化剂体系。这项工作通过展示与 Ni 催化剂的直接比较来放置在上下文中,涉及超过 40 个示例,涵盖一系列初级、二级和三级底物。这种新的 C-C 耦合具有可扩展性和可持续性,并且在某些情况下比其基于 Ni 的耦合表现出许多明显的优势。
Regioselective C–F Bond Transformations of Silyl Difluoroenolates
Herein, we report the development of a nickel-catalyzedcross-coupling reaction of silyl difluoroenolates with aryl zinc reagentsvia C–F bond cleavage. Treatment of a stoichiometric amount of Ni(0)/N-heterocyclic carbene (NHC) with silyl difluoroenolates in the presence of a lithium salt resulted in C–F bond cleavage to selectively afford the corresponding (Z)-alkenyl Ni complexes. On the basis of
在此,我们报告了通过 C-F 键断裂,镍催化二氟烯醇甲硅烷基与芳基锌试剂发生交叉偶联反应的进展。在锂盐存在下,用甲硅烷基二氟烯醇化物处理化学计量的 Ni(0)/ N-杂环卡宾 (NHC),导致 C-F 键断裂,选择性地提供相应的 ( Z )-烯基 Ni 配合物。根据观察结果,我们开发了一种催化交叉偶联反应,可选择性地产生氟烯醇盐的单一几何异构体。