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。
Copper-catalyzed synthesis of aryldiazo sulfones from arylhydrazines and sulfonyl chlorides under mild conditions
this paper, aryldiazo sulfones are prepared from tandem sulfonylation/dehydrogenation reactions of arylhydrazines and sulfonyl chlorides. The transformations proceed well in the presence of catalytic CuSO4·5H2O, leading to aryldiazo sulfones in good to excellent yields. It is believed that this protocol represents a safe and convenient model for the synthesis of these versatile aryldiazo sulfones under
Pyridine‐Catalysed Desulfonylative Addition of β‐Diketones to Arylazosulfones via Diaziridine Rearrangement
作者:Xin Ji、Ling‐Guo Meng、Hailong Xu、Lei Wang
DOI:10.1002/adsc.202001171
日期:2021.2.16
pyridine‐catalysed desulfonylative addition of β‐diketones to arylazosulfones was developed to obtain diazenyl β‐dicarbonyl compounds. The aryldiazenyl group was observed in the desired product from arylazosulfones, and this diazenylation reaction was achieved via a possible rearrangement process based on diaziridine ring cleavage. The scope of the protocol was investigated and a plausible mechanism was
Green Oxidation of Aromatic Hydrazide Derivatives Using an Oxoammonium Salt
作者:Nidheesh Phadnis、Jessica A. Molen、Shannon M. Stephens、Shayne M. Weierbach、Kyle M. Lambert、John A. Milligan
DOI:10.1021/acs.joc.3c02752
日期:2024.4.19
oxidation of the corresponding hydrazides using stoichiometric quantities of nonrecyclable oxidants. We developed a convenient alternative protocol for the oxidation of aromatic hydrazides using Bobbitt’s salt (1), a metal-free, recyclable, and commercially available oxoammonium reagent. A variety of aryl hydrazides were oxidized within 75 min at room temperature using the developed protocol. Computational
<sup><i>n</i></sup>Bu<sub>3</sub>P-Catalyzed Desulfonylative [3 + 2] Cycloadditions of Allylic Carbonates with Arylazosulfones to Pyrazole Derivatives
作者:Qi Zhang、Ling-Guo Meng、Kuai Wang、Lei Wang
DOI:10.1021/ol503735c
日期:2015.2.20
Highly efficient (Bu3P)-Bu-n-catalyzed desulfonylative [3 + 2] cycloadditions of allylic carbonates with arylazosulfones were developed for the synthesis of pyrazole derivatives. The reactions proceed smoothly under mild conditions to generate corresponding annulation products in good to excellent yields.