研究了路易斯酸催化的烯烃α-溴β-酮酰胺的原子转移自由基环化反应。发现路易斯酸Yb(OTf)3或Mg(ClO 4)2不仅促进环化反应,而且在环化产物中产生优异的反式立体控制。在Et 3 B / O 2存在下,路易斯酸Yb(OTf)3或Mg(ClO 4)2在-78°C下催化,C-烯烃β-酮酰胺的环化反应提供了环酮,而N的环化反应烯烃的β-酮酰胺导致形成γ-内酰胺,其可被转化为3-氮杂-双环[3,1,0]己-2-基。
Radical Carbofluorination of Unactivated Alkenes with Fluoride Ions
作者:Zhonglin Liu、He Chen、Ying Lv、Xinqiang Tan、Haigen Shen、Hai-Zhu Yu、Chaozhong Li
DOI:10.1021/jacs.8b03077
日期:2018.5.16
The copper-assisted radical carbofluorination of unactivatedalkenes with fluoride ions is described. With [Cu(L3)F2]H2O (L3 = 4,4'-di(methoxycarbonyl)-2,2'-bipyridine) as the fluorine source and [Ag(DMPhen)(MeCN)]BF4 (DMPhen = 2,9-dimethyl-1,10-phenanthroline) as the chloride scavenger, the reaction of unactivatedalkenes with CCl4 in acetonitrile provided the corresponding carbofluorination products
electrocatalytic strategy for the cyclopropanation of activemethylenecompounds, employing an organic catalyst. The method shows a broad substrate scope and excellent scalability, requires no metal catalyst or external chemical oxidant, and provides convenient access to several types of cyclopropane-fused heterocyclic and carbocyclic compounds. Mechanistic investigations suggest that the reactions
GOLD CATALYZED HYDROAMINATION OF ALKYNES AND ALLENES
申请人:Bertrand Guy
公开号:US20110166349A1
公开(公告)日:2011-07-07
Methods are provided for the catalytic hydroamination of compounds having an alkyne or allene functional group, in which the compound is contacted with ammonia or an amine in the presence of a catalytic amount of a gold complex under conditions sufficient for hydroamination to occur.
Catalytic amination of diethylene glycol with tert‑butylamine to tertiarybutylaminoethoxyethanol over NiCu/Al2O3 catalysts: Facilitation of NiCu alloy
作者:Xiaozhong Wang、Jiali Hu、Cai Xu、Yingqi Chen、Liyan Dai
DOI:10.1016/j.mcat.2023.113359
日期:2023.8
center, contributing to the enhanced catalytic activity. Moreover, the effects of reaction parameters on catalytic activity were explored. There was no need for a solvent, only 3 molar equivalents of tert‑butylamine (TBA) and 1 wt.% catalyst was required. After 7 h of reaction at 220 °C, satisfactory conversion (89.6%) and selectivity (84.6%) were obtained over the prepared catalyst. Cycle experiment
Selective Approach toward Multifunctionalized Lactams by Lewis Acid Promoted PhSe Group Transfer Radical Cyclization
作者:Jin-Di Yu、Wei Ding、Gao-Yan Lian、Ke-Sheng Song、Dan-Wei Zhang、Xiang Gao、Dan Yang
DOI:10.1021/jo100139u
日期:2010.5.21
We have developed a regiospecific and highly stereoselective strategy for constructing the five-/six-membered monocyclic and bicyclic nitrogen heterocycle skeletons using PhSe group transfer radical cyclization of alpha-phenylseleno amido esters promoted by a Lewis acid (e.g., Yb(OTf)(3)) under UV irradiation. We obtained 5-/6-exo-trig mode cyclization products for the N-allyl/homoallyl substrates, whereas the enamide substrate gave 5-endo-trig ring closure.