General and Practical Potassium Methoxide/Disilane-Mediated Dehalogenative Deuteration of (Hetero)Arylhalides
作者:Xin Wang、Ming-Hui Zhu、David P. Schuman、Dayou Zhong、Wen-Yan Wang、Lin-Yang Wu、Wei Liu、Brian M. Stoltz、Wen-Bo Liu
DOI:10.1021/jacs.8b07597
日期:2018.9.5
Herein we describe a general, mild and scalable method for deuterium incorporation by potassium methoxide/hexamethyldisilane-mediated dehalogenation of arylhalides. With CD3CN as a deuterium source, a wide array of heteroarenes prevalent in pharmaceuticals and bearing diverse functional groups are labeled with excellent deuterium incorporation (>60 examples). The ipso-selectivity of this method provides
在此,我们描述了一种通过甲醇钾/六甲基乙硅烷介导的芳基卤化物脱卤来掺入氘的通用、温和且可扩展的方法。以 CD3CN 作为氘源,广泛存在于药物中并具有不同官能团的杂芳烃被标记为具有优异的氘掺入(> 60 个例子)。这种方法的 ipso 选择性提供了对氘代吲哚和喹啉库的精确访问。我们方法的合成效用已通过将氘掺入复杂的天然和类药物化合物中得到证明。
We report the catalytic reduction of a C–Obond and the borylation by a rhodium complex bearing an X-type PAlP pincer ligand. We have revealed the reaction mechanism based on the characterization of the reaction intermediate and deuterium-labeling experiments. Notably, this novel catalytic system shows steric-hindrance-dependent chemoselectivity that is distinct from conventional Ni-based catalysts
Improved Process for the Palladium-Catalyzed C–O Cross-Coupling of Secondary Alcohols
作者:Hong Zhang、Paula Ruiz-Castillo、Alexander W. Schuppe、Stephen L. Buchwald
DOI:10.1021/acs.orglett.0c01668
日期:2020.7.17
An improved protocol for the Pd-catalyzed C–O cross-coupling of secondaryalcohols is described. The use of biaryl phosphine L2 as the ligand was key to achieving efficient cross-coupling of (hetero)aryl chlorides with only a 20% molar excess of the alcohol. Additionally, we observed an unusual reactivity difference between an electron-rich aryl bromide and the analogous aryl chloride, and deuterium-labeling
A Single Phosphine Ligand Allows Palladium-Catalyzed Intermolecular CO Bond Formation with Secondary and Primary Alcohols
作者:Xiaoxing Wu、Brett P. Fors、Stephen L. Buchwald
DOI:10.1002/anie.201104361
日期:2011.10.10
Forging a bond: An efficient, general palladium catalyst for CObond‐forming reactions of secondary and primaryalcohols with a range of aryl halides has been developed using the ligand 1. Heteroaryl halides, and for the first time, electron‐rich aryl halides can be coupled with secondaryalcohols. A diverse set of substrate combinations are possible with just a singleligand, thus obviating the need
形成键:使用配体1开发了一种高效、通用的钯催化剂,用于仲醇和伯醇与一系列芳基卤化物的C O 键形成反应。杂芳基卤化物和富电子芳基卤化物首次可以与仲醇偶联。只需一个配体即可实现多种底物组合,因此无需调查多个配体。