在含有微量水的 MeCN 中,在Et 3 N 存在下,分子碘介导的 3-乙酰基-2 H -chromen -2-ones、β-溴代-β-硝基苯乙烯和吡啶合成角氧杂三嗪核心是发达。该反应通过 2-oxo-2-(2-oxo-2 H -chromen-3-yl)-1-(pyridin-1-ium-1-yl)ethan-1-ide 与溴硝基苯乙烯的分子间迈克尔反应进行通过分子内迈克尔反应和消除步骤。典型产品的立体化学证据来自单晶 X 射线分析。该策略的重要特征是它形成了三个具有良好选择性的立体中心。
Cascade reactions initiated by radical addition of tetrahydrofuran to β-bromonitrostyrenes
作者:Xin Ge、Kim Le Mai Hoang、Min Li Leow、Xue-Wei Liu
DOI:10.1039/c4ra08357a
日期:——
Silver(i) catalyzed addition of THF radical to β-bromonitrostyrenes under mild basic condition in the presence of air has been developed.
在温和碱性条件下,银(i)催化的四氢呋喃自由基加成到β-溴硝基苯乙烯中,并在空气存在下发展起来的。
Reactions of bromonitroalkenes with tervalent phosphorus. Part I. Reaction in aprotic solvents
作者:Celestine J. Devlin、Brian J. Walker
DOI:10.1039/p19730001428
日期:——
The reaction of a variety of 2-substituted 1-bromo-1-nitroethylenes with triphenylphosphine in benzene or ethyl acetate gave good yields of cyanomethyl(triphenyl)phosphonium salts, which on treatment with base afforded the corresponding ylides. An analogous cyanomethylphosphonate was obtained from a reaction with triethyl phosphite. Three alternative sites of initial attack by phosphine are considered
A Molecular Iodine-Mediated Synthesis of Cyclopenta[<i>c</i>]furo[3,2-<i>b</i>]furan-5,6-diones: Assembly of an Angular Dioxatriquinane Core
作者:Issa Yavari、Ramin Mohsenzadeh、Parisa Ravaghi
DOI:10.1021/acs.joc.1c02572
日期:2022.3.4
A molecular iodine-mediated synthesis of angular oxatriqinane core from 3-acetyl-2H-chromen-2-ones, β-bromo-β-nitrostyrenes, and pyridine in the presence of Et3N in MeCN containing a trace amount of water was developed. The reaction proceeds via intermolecular Michael reaction of 2-oxo-2-(2-oxo-2H-chromen-3-yl)-1-(pyridin-1-ium-1-yl)ethan-1-ide with bromonitrostyrene followed by intramolecular Michael
在含有微量水的 MeCN 中,在Et 3 N 存在下,分子碘介导的 3-乙酰基-2 H -chromen -2-ones、β-溴代-β-硝基苯乙烯和吡啶合成角氧杂三嗪核心是发达。该反应通过 2-oxo-2-(2-oxo-2 H -chromen-3-yl)-1-(pyridin-1-ium-1-yl)ethan-1-ide 与溴硝基苯乙烯的分子间迈克尔反应进行通过分子内迈克尔反应和消除步骤。典型产品的立体化学证据来自单晶 X 射线分析。该策略的重要特征是它形成了三个具有良好选择性的立体中心。
CAN-mediated new, regioselective one-pot access to bicyclic cationic structures with 2,3-dihydro-1H-pyrazolo[1,2-a]pyrazol-4-ium core
作者:Mikhail I. Pleshchev、Nikita V. Das Gupta、Vladimir V. Kuznetsov、Ivan V. Fedyanin、Vadim V. Kachala、Nina N. Makhova
DOI:10.1016/j.tet.2015.09.033
日期:2015.11
[3+2]-cycloaddition of (2-bromo-2-nitrovinyl)arenes to N,N-cyclic azomethine imines, generated in situ by diaziridine ringopening in 6-Ar-1,5-diazabicyclo[3.1.0]hexanes or by metathesis of initially formed azomethine imine, followed by one-pot aromatization of the formed pyrazolidine ring.