Methyl (Z)-3-bromo-3-(4-methylbenzenesulfonyl)prop-2-enoate: Synthesis and reactions with dimethyl malonate and methyl acetoacetate
摘要:
Bromination-dehydrobromination of methyl (E)-3-(4-methylbenzenesulfonyl)prop-2-enoate gave methyl (Z)-3-bromo-3-(4-methylbenzenesulfonyl)prop-2-enoate whose structure was determined by X-ray analysis. Methyl (Z)-3-bromo-3-(4-methylbenzenesulfonyl)prop-2-enoate behaved as a synthetic equivalent of methyl 3-(4-methylbenzenesulfonyl)prop-2-ynoate in reactions with dimethyl malonate and methyl acetoacetate, which afforded the corresponding Michael adducts, trimethyl 3-(4-methylbenzenesulfonyl)prop-1-ene-1,1,2-tricarboxylate and dimethyl (Z)-2-acetyl-3-(4-methylbenzenesulfonyl)but-2-enedioate, respectively, via nucleophilic attack on the beta-position with respect to the sulfonyl group.
Synthesis of 3,3-diphenyl-3H-pyrazoles applying vinyl sulfones as chemical equivalents of acetylenes in reaction of 1,3-dipolar cycloaddition to diphenyldiazomethane
作者:V. A. Vasin、V. V. Razin、E. V. Bezrukova、D. Yu. Korovin、P. S. Petrov、N. V. Somov
DOI:10.1134/s1070428015080138
日期:2015.8
α-bromovinyl phenylsulfones and a-bromovinyl methyl sulfones with diphenyldiazomethane afforded the corresponding 3-bromo- 5,5-diphenyl-3-sulfonyl-Δ1-pyrazolines. The first among them at 20°C suffered spontaneous elimination of molecular nitrogen and converted into 1-bromo-2,2-diphenyl-1-(phenylsulfonyl)cyclopropane whose structure was established by X-ray diffraction analysis. The action of DBU on another
Regioselective and stereoselective sulfonylation of alkynylcarbonyl compounds in water
作者:Wenyi Li、Guoxing Yin、Lei Huang、Yan Xiao、Zhimin Fu、Xiu Xin、Fang Liu、Zhizhang Li、Weimin He
DOI:10.1039/c6gc01196a
日期:——
A simple and efficient route for the synthesis of Z-[small beta]-sulfonyl-[small alpha],[small beta]-unsaturated carbonylcompounds by using water as the solvent and hydrogen source is developed.
Metal-free Oxidative Coupling of Aromatic Alkenes with Thiols Leading to (<i>E</i>)-Vinyl Sulfones
作者:Leilei Wang、Huilan Yue、Daoshan Yang、Huanhuan Cui、Minghui Zhu、Jinming Wang、Wei Wei、Hua Wang
DOI:10.1021/acs.joc.7b00994
日期:2017.7.7
A facile I2O5-mediated direct oxidative coupling of aromatic alkenes with thiols toward vinyl sulfones has been developed under metal-free conditions. This methodology provides a convenient and efficient approach to various (E)-vinyl sulfones from readily available starting materials with excellent regioselectivity. The present oxidative coupling reaction, not only expands the scope of functionalization
在无金属条件下,已经开发出一种简便的由I 2 O 5介导的芳香族烯烃与硫醇向乙烯基砜的直接氧化偶合的方法。该方法学提供了一种简便有效的方法,可从易于获得的起始材料中以优异的区域选择性来制备各种(E)-乙烯基砜。目前的氧化偶合反应不仅扩大了烯烃与硫醇的官能化范围,而且使其成为对(E)-乙烯基砜的传统合成方法的实用而有力的补充。
A Mild and Rapid Synthesis of (<i>Z</i>)-<i>β</i>-Sulfonyl Enoates from Sodium Sulfinates and Propargyl Esters
Water‐promoted sulfonylation of propargyl esters leading to highly regioselective and stereoselective formation of (Z)‐β‐sulfonyl enoates in excellent yields, by a simple, mild, rapid and environmentally benign reaction procedure is reported.
PhI(OAc)2/KI-Mediated Reaction of Aryl Sulfinates with Alkenes, Alkynes, and α,β-Unsaturated Carbonyl Compounds: Synthesis of Vinyl Sulfones and β-Iodovinyl Sulfones
(Diacetoxyiodo)benzene [PhI(OAc) 2 , DIB] was able to promote the reaction of sodium aryl sulfinate and potassium iodide (KI) with alkenes and alkynes to afford the corresponding vinyl sulfones and β-iodovinyl sulfones, respectively, in good yields. The salient features of this reaction are that it employs a commercially available and environmentally benign hypervalent iodine(III) reagent, a one-step