6-triisopropylbenzenesulfonylhydrazone (trisylhydrazone) of cyclodecanone 11c with alpha-magnesio methylphenylsulfone afforded the methylidene derivative 12a contaminated with the Shapiro product 13. Tosylhydrazone 2 resisted reaction with i-PrMgCl and gave only a small amount of the addition product in reaction with Bu(2)Mg. Some mechanistic aspects of the reaction of tosylhydrazones with organomagnesium compounds
Deep Eutectic Solvents as Reaction Media for the Palladium-Catalysed C−S Bond Formation: Scope and Mechanistic Studies
作者:Xavier Marset、Gabriela Guillena、Diego J. Ramón
DOI:10.1002/chem.201702892
日期:2017.8.4
system based on deep eutectic solvents and palladium nanoparticles where C−S bonds are formed from aryl boronic acids and sodium metabisulfite, is introduced. The functionalization step is compatible with a broad spectrum of reagents such as nucleophiles, electrophiles or radical scavengers. This versatile approach allows the formation of different types of products in an environmentally friendly medium
Alkylation of Nitropyridines via Vicarious Nucleophilic Substitution
作者:Damian Antoniak、Michał Barbasiewicz
DOI:10.1021/acs.orglett.1c03920
日期:2022.1.21
Electrophilic nitropyridines react with sulfonyl-stabilized carbanions to give products of C–H alkylation via vicariousnucleophilicsubstitution. The process consists of formation of the Meisenheimer-type adduct followed by base-induced β-elimination of the sulfinic acid (e.g., PhSO2H). Mechanistic studies reveal that in the latter step alkyl substituent and adjacent nitro group tend to planarize
Mn-mediated reductive C(sp3)–Si coupling of activated secondary alkyl bromides with chlorosilanes
作者:Liangliang Qi、Xiaobo Pang、Kai Yin、Qiu-Quan Pan、Xiao-Xue Wei、Xing-Zhong Shu
DOI:10.1016/j.cclet.2022.03.070
日期:2022.12
solution to address this problem, but it typically relies on organometallic species. Herein, we report an Mn-mediated reductive C(sp3)–Si coupling to synthesize these compounds from alkyl and silyl electrophiles. This approach avoids the requirement for activation of Si–Cl by transition metals and thus allows for the coupling of various common chlorosilanes. The reaction proceeds under mild conditions
Nickel catalyzed three-component sulfonylation of non-activated alkyl chlorides
作者:Chang Gu、Zhuochen Wang、Renyi Shi
DOI:10.1039/d3cc01447a
日期:——
of readily available non-activated alkyl chlorides. A wide range of alkylarylsulfones can be synthesized from alkyl chlorides, aryl boronic acids, and potassium metabisulfite, a cheap, efficient, and commercially available SO2 source under simple and easy-to-handle reaction conditions. High selectivity can be achieved with a slight excess of phenylboronic acid and a sulfur dioxide source.
我们描述了镍催化的三组分磺酰化现成的非活化烷基氯。可以在简单且易于处理的反应条件下,从烷基氯、芳基硼酸和焦亚硫酸钾合成各种烷基芳基砜,焦亚硫酸钾是一种廉价、高效且可商购的 SO 2 来源。稍微过量的苯基硼酸和二氧化硫源可以实现高选择性。