A novel Fe-catalyzed olefin hydroamination with aryldiazo sulfones for accessing alkylarylazo compounds has been successfully developed. Aryldiazo sulfones are used as radical acceptors, and N–N double bonds will be regenerated when an arene sulfonyl group leaves. The reaction features mild reaction conditions and a broad substrate scope, allowing access to many azo compounds that would be difficult
Rhodium(II)-Catalyzed Synthesis of<i>N</i>-Aryl-<i>N′</i>-tosyldiazenes from Primary Aromatic Amines Using (Tosylimino)aryliodinane: A Potent Stable Surrogate for Diazonium Salts
The first example of the single-step synthesis of N-aryl-N'-tosyldiazenes from primary aromaticamines is described. A wide range of aromaticamines provided the corresponding products in high yields via an N−N bond formation with Rh(II)-nitrene intermediates, generated in situ from dirhodium(II) complex catalysts and (tosylimino)-2,4,6-trimethylphenyliodinane (TsN=IMes), followed by oxidation. The
描述了从芳香伯胺一步合成 N-芳基-N'-甲苯磺酰基二氮烯的第一个例子。范围广泛的芳香胺通过与 Rh(II)-硝烯中间体形成 NN 键以高产率提供相应的产物,由二铑 (II) 配合物催化剂和 (tosylimino)-2,4,6- 原位生成三甲基苯基碘烷 (TsN=IMes),然后氧化。合成的 N-芳基-N'-甲苯磺酰基二氮烯已成功证明可作为重氮盐在芳香伯胺的两步脱氨基转化中的有效稳定替代物。
Palladium-catalyzed Suzuki cross-coupling of N′-tosyl arylhydrazines
作者:Jin-Biao Liu、Hui Yan、Hui-Xuan Chen、Yu Luo、Jiang Weng、Gui Lu
DOI:10.1039/c3cc41421c
日期:——
The first palladium-catalyzedSuzukicross-coupling of N'-tosyl arylhydrazines with various organoboron reagents has been developed for the preparation of biaryl compounds in high yields. N'-Tosyl arylhydrazine as a readily available and stable electrophile also demonstrated its generality in a number of coupling reactions.
Efficient synthesis of aryl hydrazines using copper-catalyzed cross-coupling of aryl halides with hydrazine in PEG-400
作者:Junmin Chen、Yimin Zhang、Wenyan Hao、Rongli Zhang、Fei Yi
DOI:10.1016/j.tet.2012.11.014
日期:2013.1
An efficient and convenient method for the synthesis of aryl hydrazines is described via copper-catalyzed cross-coupling of arylhalides with aqueous hydrazine in PEG-400. This protocol is applicable to both electron-deficient and electron-rich aryl iodides and bromides, and even to sterically hindered substrates, giving aryl hydrazines in good to excellent yields.
Palladium-catalyzed Suzuki cross-coupling of arylhydrazines via CNHNH2 bond activation in water
作者:Jin-Biao Liu、He-Ping Zhou、Yi-Yuan Peng
DOI:10.1016/j.tetlet.2014.03.092
日期:2014.4
A novel palladium-catalyzedSuzukicross-coupling reaction of arylhydrazine with aryl boronic acid is described, which affords the corresponding biaryl compounds in good yields. This transformation proceeds through a CNHNH2 bond activation under green conditions.