Iron-Catalyzed Dioxygen-Driven C–C Bond Formation: Oxidative Dearomatization of 2-Naphthols with Construction of a Chiral Quaternary Stereocenter
摘要:
Iron(salan) complex 1 was found to catalyze the oxidative dearomatization of 1-substituted 2-naphthols with the formation of an all-carbon quaternary stereocenter in air in the presence of nitroalkanes, to afford the corresponding cyclic enones with high enantioselectivity of 88-96% ee.
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。
Application of a CC Bond-Forming Conjugate Addition Reaction in Asymmetric Dearomatization of β-Naphthols
作者:Dongxu Yang、Linqing Wang、Ming Kai、Dan Li、Xiaojun Yao、Rui Wang
DOI:10.1002/anie.201503056
日期:2015.8.10
conjugate reaction was successfully applied to the enantioselectivedearomatization of β‐naphthols. A C(sp2)C(sp3) bond is formed by using propargylic ketones as reactive partners. Good to excellent Z/E ratios and ee values were obtained by employing an in situgeneratedmagnesiumcatalyst. Further transformations of the Z‐configured CC double bond in the products were achieved under mild reaction conditions
AC C键形成共轭反应成功地应用于β萘酚的对映选择性脱芳构化。AC(sp2)C(sp3)键是通过使用炔丙基酮作为反应伙伴而形成的。 通过使用原位生成的镁催化剂获得了良好的Z / E 比和ee值。在温和的反应条件下,产物中Z构型的CC双键进一步转化。此外,通过计算化学探索了这种镁催化的脱芳香化反应的立体控制元素。
Palladium-Catalyzed Intermolecular Asymmetric Allylic Dearomatization Reaction of Naphthol Derivatives
作者:Chun-Xiang Zhuo、Shu-Li You
DOI:10.1002/anie.201304591
日期:2013.9.16
Baring all: The title reaction provides β‐naphthalenones bearing an all‐carbon quaternary center in good to excellent yields, as well as excellent chemo‐ and enantioselectivity (see scheme).
Intermolecular Enantioselective Dearomatization Reaction of β-Naphthol Using<i>meso</i>-Aziridine: A Bifunctional In Situ Generated Magnesium Catalyst
作者:Dongxu Yang、Linqing Wang、Fengxia Han、Dan Li、Depeng Zhao、Rui Wang
DOI:10.1002/anie.201410257
日期:2015.2.9
A direct, facile, and highly diastereo‐ and enantioselectivedearomatizationreaction of β‐naphthol derivatives with aziridines has been developed for the first time. A newly designed Box–OH ligand was employed for an in situgeneratedmagnesiumcatalyst and proved to be efficient. The corresponding dearomatization product was transformed into a polycyclic scaffold and polyhydroxylated compound. 1H NMR
β-萘酚衍生物与氮丙啶的直接,简便,高度非对映和对映选择性脱芳香化反应已得到首次开发。一种新设计的Box-OH配体用于原位生成的镁催化剂,并被证明是有效的。将相应的脱芳香化产物转化成多环支架和多羟基化的化合物。1 H NMR研究揭示了β-萘酚脱芳香化过程的活化模式,并且在反应中观察到明显的正非线性效应,并提供了对Mg II中心周围的配位环境和可能的活性物质的见解。
Mg<sup>II</sup>-Mediated Catalytic Asymmetric Dearomatization (CADA) Reaction of β-Naphthols with Dialkyl Acetylenedicarboxylates
作者:Linqing Wang、Dongxu Yang、Dan Li、Pengxin Wang、Kezhou Wang、Jie Wang、Xianxing Jiang、Rui Wang
DOI:10.1002/chem.201601399
日期:2016.6.13
MgII‐mediated catalytic asymmetricdearomatization (CADA) reaction of β‐naphthols has been developed. The reaction proceeds under ambient temperature and give a series of chiral trisubstituted olefins with good chemoselectivities, Z/E ratios, and excellent enantioselectivities. A fluorinated β‐naphthol was designed to generate chiral organofluorine skeletons through the current CADA reaction. Moreover, an interesting