Palladium-catalyzed allylic alkylation dearomatization of β-naphthols and indoles with <i>gem</i>-difluorinated cyclopropanes
作者:Zhiyuan Fu、Jianping Zhu、Songjin Guo、Aijun Lin
DOI:10.1039/d0cc07529a
日期:——
route to access 2-fluoroallylic β-naphthalenones and indolenines bearing quaternary carbon centers in good yields with high Z-selectivity via C–C bond activation, C–F bond cleavage and the dearomatization process, benefiting from the wide substrate scope and good functional group tolerance. Moreover, 2-fluoroallylic furanoindoline and pyrroloindolines were achieved in good efficiency via cascade allylic
The first visible‐light‐promoted dearomative fluoroalkylation of β‐naphthols was realized without the assistance of any transition‐metal catalysts or external photosensitizers. Inexpensive fluoroalkyl iodides were directly used as efficient fluoroalkylation reagents under very mild reaction conditions. The scope of this process was found to be general and broad, and both trifluoromethyl and perfluoroalkyl
在没有任何过渡金属催化剂或外部光敏剂的帮助下,实现了第一个由可见光促进的β-萘酚脱芳基氟烷基化反应。廉价的氟代烷基碘化物在非常温和的反应条件下直接用作有效的氟代烷基化试剂。发现该方法的范围是一般性的,范围很广,三氟甲基和全氟烷基(-C 4 F 9,-C 6 F 13和-C 8 F 17)以极高的收益进行安装。初步的机理研究表明,在无光催化剂的情况下,萘甲酸酯-氟代烷基碘的电子供体-受体(EDA)复合物中可见光促进了分子间的电荷转移。
Palladium(0)-Catalyzed Intermolecular Arylative Dearomatization of β-Naphthols
作者:Ren-Qi Xu、Ping Yang、Hang-Fei Tu、Shou-Guo Wang、Shu-Li You
DOI:10.1002/anie.201608724
日期:2016.11.21
The first Pd0‐catalyzed intermolecular arylative dearomatization of β‐naphthols with aryl halides is described. It was found that Q‐Phos could facilitate the palladium‐catalyzed cross‐coupling‐type dearomatization of β‐naphthols, while avoiding O‐arylation, to construct 2‐naphthalenones in excellent yields and with high chemoselectivity.
Chiral Phosphoric Acid Catalyzed Asymmetric Oxidative Dearomatization of Naphthols with Quinones
作者:Gongming Zhu、Guangjun Bao、Yiping Li、Junxian Yang、Wangsheng Sun、Jing Li、Liang Hong、Rui Wang
DOI:10.1021/acs.orglett.6b02609
日期:2016.10.21
A highly enantioselective oxidative dearomatization of naphthols with quinones catalyzed by a chiral spirocyclic phosphoricacid is described. The strategy provides concise access to enantioenriched cyclohexadienones with a quinone moiety. Remarkably, the obtained products could be easily transformed to a potentially useful dihydronaphtho[2,1-b]benzofuran scaffold.
描述了手性螺环磷酸催化的萘醌对苯酚的高度对映选择性氧化脱芳香化反应。该策略为具有醌部分的对映体富集的环己二酮提供了简洁的途径。值得注意的是,所获得的产物可以容易地转化为潜在有用的二氢萘[2,1- b ]苯并呋喃支架。
<i>N</i>-Trifluoromethylthio-dibenzenesulfonimide: A Shelf-Stable, Broadly Applicable Electrophilic Trifluoromethylthiolating Reagent
The super electrophilicity of a shelf-stable, easily prepared trifluoromethylthiolating reagent N-trifluoromethylthio-dibenzenesulfonimide 7 was demonstrated. Consistent with the theoretical prediction, 7 exhibits reactivity remarkably higher than that of other known electrophilic trifluoromethylthiolating reagents. In the absence of any additive, 7 reacted with a wide range of electron-rich arenes