Electrosynthesis of vinyl sulfones from alkenes and sulfonyl hydrazides mediated by KI: Аn electrochemical mechanistic study
作者:Alexander O. Terent'ev、Olga M. Mulina、Dmitry A. Pirgach、Alexey I. Ilovaisky、Mikhail A. Syroeshkin、Nadezhda I. Kapustina、Gennady I. Nikishin
DOI:10.1016/j.tet.2017.10.047
日期:2017.12
sulfones were prepared from alkenes and sulfonyl hydrazides via electrochemical oxidative sulfonylation. The reaction proceeds in an experimentally convenient undivided electrochemical cell equipped with graphite and iron electrodes employing KI as a redox catalyst and a supporting electrolyte. Applying extremely high current density up to 270 mA/cm2 permits rapid synthesis in a compact reactor and
由烯烃和磺酰肼通过电化学氧化磺酰化反应制备了各种乙烯基砜。该反应在配备了石墨和铁电极且使用KI作为氧化还原催化剂和支持电解质的实验方便的未分隔电化学电池中进行。施加高达270 mA / cm 2的极高电流密度,可以在紧凑的反应器中以小表面积电极快速合成。利用循环伏安法提出了一种可能的反应机理。在该反应中阳极和阴极过程的结合使得可以在温和的条件下以中等至高的产率获得产物。
Metal-free sulfonyl radical-initiated cascade cyclization to access sulfonated indolo[1,2-<i>a</i>]quinolines
A metal-free cascade reaction was developed for the synthesis of indolo[1,2-a]quinoline derivatives from arylsulfonyl hydrazides and 1-(2-(arylethynyl)phenyl)indoles in the presence of TBAI/TBHP. Impressively, these products exhibit excellent fluorescence properties, which is promising for cell imaging.
开发了一种无金属级联反应,用于在TBAI / TBHP存在下由芳基磺酰基酰肼和1-(2-(芳基乙炔基)苯基)吲哚合成吲哚并[1,2- a ]喹啉衍生物。令人印象深刻的是,这些产品具有出色的荧光特性,有望用于细胞成像。
Iodine-catalyzed sulfonylation of sulfonyl hydrazides with <i>tert</i>-amines: a green and efficient protocol for the synthesis of sulfonamides
作者:Jinyang Chen、Xiaoran Han、Lan Mei、Jinchuan Liu、Kui Du、Tuanwu Cao、Qiang Li
DOI:10.1039/c9ra07361b
日期:——
This study provides a direct, sustainable and eco-friendly method for the synthesis of various sulfonamides via the sulfonylation of sulfonyl hydrazides with tert-amines. The method utilizes sulfonyl hydrazides to oxidize and couple with tertiary amines through selective cleavage of C–N bonds. In this reaction, molecular iodine was used as the catalyst and t-butyl hydroperoxide was used as the oxidant
A set of transition-metal-free NaI/TBHP-mediated sulfonylation cyclization reactions of methylthiolated alkynones with sulfonyl hydrazides was developed, by which various 3-sulfonylated thioflavones were prepared under mild reaction conditions.
Iodine-Promoted Deoxygenative Iodization/Olefination/Sulfenylation of Ketones with Sulfonyl Hydrazides: Access to β-Iodoalkenyl Sulfides
作者:Yishu Bao、Xiuqin Yang、Qingfa Zhou、Fulai Yang
DOI:10.1021/acs.orglett.8b00511
日期:2018.4.6
stereoselective synthesis of β-haloalkenyl sulfides using commercially available ketones and sulfonyl hydrazides as starting materials has been developed. This protocol obviates the need for alkynes and traditional sulfenylating agents and therefore opens up a new door to construct β-iodoalkenyl sulfides in a highly simple manner. This study reveals that ketones could be used as vinyl iodide precursors