Ni-Catalyzed Reductive Dicarbofunctionalization of Nonactivated Alkenes: Scope and Mechanistic Insights
作者:Wei Shu、Andrés García-Domínguez、M. Teresa Quirós、Rahul Mondal、Diego J. Cárdenas、Cristina Nevado
DOI:10.1021/jacs.9b02973
日期:2019.9.4
bond. The role of the reductant was also investigated in depth, suggesting that a one-electron reduction of Ni(II) species to Ni(I) is thermodynamically favored. Further, the preferential activation of alkyl vs aryl halides by ArNi(I) complexes as well as the high affinity of ArNi(II) for secondary over tertiary C-centered radicals explains the lack of undesired homo- and direct coupling products (Ar-Ar
Palladium-Catalyzed Remote Diborylative Cyclization of Dienes with Diborons via Chain Walking
作者:Shota Kanno、Fumitoshi Kakiuchi、Takuya Kochi
DOI:10.1021/jacs.1c09705
日期:2021.11.24
A novel method for catalytic remote bismetalation of alkene substrates by the addition of dimetal reagents is accomplished by using chain walking. In the presence of a palladium catalyst, the reaction of various 1,n-dienes and diborons were converted into cyclopentane derivatives with two boryl groups at remote positions via facile regioselective transformation of an unactivated sp3 C–H bond to a C–B
A polymer containing units represented by the defined formula (1); and a process for producing the polymer, which comprises the step of polymerizing a compound represented by the defined formula (3), the units represented by the formula (1) being polymerized units of the compound represented by the formula (3) such as 5,5-diallylbarbituric acid.
Photosensitization enables Pauson-Khand–type reactions with nitrenes
作者:Fang Li、W. Felix Zhu、Claire Empel、Oleksandr Datsenko、Adarsh Kumar、Yameng Xu、Johanna H. M. Ehrler、Iuliana Atodiresei、Stefan Knapp、Pavel K. Mykhailiuk、Ewgenij Proschak、Rene M. Koenigs
DOI:10.1126/science.adm8095
日期:2024.2.2
The Pauson-Khand reaction has in the past 50 years become one of the most common cycloaddition reactions in chemistry. Coupling two unsaturated bonds with carbon monoxide, the transformation remains limited to CO as a C 1 building block. Herein we report analogous cycloaddition reactions with nitrenes as an N 1 unit. The reaction of a nonconjugated diene with a nitrene precursor produces bicyclic bioisosteres
Pauson-Khand 反应在过去 50 年中已成为化学中最常见的环加成反应之一。将两个不饱和键与一氧化碳偶联,转化仍然限于 CO 作为 C 1积木。在此,我们报道了以氮宾作为 N 的类似环加成反应1单元。非共轭二烯与氮宾前体的反应产生常见饱和杂环的双环生物等排体,例如哌啶、吗啉和哌嗪。实验和计算机理研究支持将三线态氮烯的双自由基性质传递到 π 系统中。我们展示了该反应在药物化合物的后期功能化和可溶性环氧化物水解酶抑制剂的发现中的实用性。
Azidosulfonylation of alkenes, dienes, and enynes
作者:Nathalie Mantrand、Philippe Renaud
DOI:10.1016/j.tet.2008.09.096
日期:2008.12
The radical mediated aziclosulfonylation of various alkenes and alkynes that are able to undergo a rapid radical rearrangement is reported. For instance, treatment of 1,6-dienes or 1-en-6-ynes with benzenesulfonyl azide affords cyclic azidosulfones. High yields are observed when tertiary alkyl radicals are azidated in the last step of the cascade process. The aziclosulfonylation of P-pinene involving ring opening of the bicyclic skeleton is also reported. (C) 2008 Elsevier Ltd. All rights reserved.