various alkenes with sulfonyl radical sources (RSO2NHNH2) and Et3N·3HF as cost-effective fluorination reagents under mild conditions. Remarkably, this protocol features very green and sustainable conditions obviating the need of chemical oxidants and transition metal catalyst. A variety of substituents on both sulfonyl hydrazides and alkenes are tolerated to give vicinal fluorinated sulfones in moderate
在此,我们报道了在温和条件下,使用磺酰基自由基源(RSO 2 NHNH 2)和 Et 3 N·3HF 作为具有成本效益的氟化试剂对各种烯烃进行实用且有效的氟磺酰化。值得注意的是,该协议具有非常绿色和可持续的条件,无需化学氧化剂和过渡金属催化剂。磺酰肼和烯烃上的各种取代基都可以耐受,从而以中等至优异的产率产生邻位氟化砜。此外,这种转化的合成效用通过克级反应和复杂分子的后期功能化得到进一步证明。
Palladium‐Catalyzed Regio‐ and Stereoselective Sulfonylation of Aryl Propiolates with Sulfonyl Hydrazides: Access to (
<i>E</i>
)‐
<i>β</i>
‐Aryl Sulfonyl Acrylates
An efficient method for the synthesis of (E)‐β‐arylsulfonylacrylates has been reported. This palladium‐catalyzed approach showed excellent regio‐ and stereoselectivity in the sulfonylation of arylpropiolates with sulfonylhydrazides. Through this approach, a wide range of (E)‐β‐arylsulfonylacrylates were obtained in moderate to high yields.
<i>Syn</i>-Stereoselective C3-Spirocyclization and C2-Amination of 3-(2-Isocyanoethyl)indole Using <i>C</i>,<i>N</i>-Cyclic Azomethine Imines
作者:Wen-Bin Cao、Jian-Dong Zhang、Meng-Meng Xu、Hua-Wei Liu、Hai-Yan Li、Xiao-Ping Xu、Shun-Jun Ji
DOI:10.1021/acs.orglett.2c01736
日期:2022.7.1
underexplored reaction mode of C,N-cyclic azomethineimines, a catalyst-free [1+2+3] cycloaddition/N–N bond cleavage sequential reaction for accessing spiroindolines with syn-stereoselectivity was developed. On the basis of experimental results and DFT calculations, peroxide and ethereal solvent were identified to trigger the hydrogen abstraction of the unstable [1+2+3] cycloaddition adducts, followed
Aloe emodin-conjugated sulfonyl hydrazones as novel type of antibacterial modulators against S. aureus 25923 through multifaceted synergistic effects
作者:Zhao Deng、Rammohan R. Yadav Bheemanaboina、Yan Luo、Cheng-He Zhou
DOI:10.1016/j.bioorg.2022.106035
日期:2022.10
Aloe emodin-conjugated sulfonyl hydrazones were designed and synthesized as novel type of antibacterial modulators. Aloe emodin benzenesulfonyl hydrazone 5a (AEBH-5a) was preponderant for the treatment of S. aureus 25923 (MIC = 0.5 μg/mL) over norfloxacin and presented high selectivity between bacterial membranes and mammalian membranes. Especially, AEBH-5a could eliminate the formed biofilms and relieve
Catalyst-free electrochemical sulfonylation of amines with sulfonyl hydrazide in aqueous medium
作者:Wei Chen、Haojian Xu、Run Wu、Yang Chen、Pingbing Yu、Yanxi Jin
DOI:10.1039/d3ob00690e
日期:——
with sulfonyl hydrazides under exogenous-oxidant-free and catalyst-free conditions in aqueous medium was developed. A wide variety of sulfonamides were prepared via a simple electrochemical process from various cyclic or acyclic secondary amines, as well as more challenging free primary amines with equivalent amount of aryl/heteroaryl hydrazides in air under mild conditions. This protocol was found