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。
Iron(II) Chloride-Catalyzed Nitrene Transfer Reaction for Dearomative Amination of β-Naphthols with Aryl Azides
作者:Dun-Qi Wu、Zhen-Yu Guan、Yi Peng、Jian Sun、Cheng Zhong、Qing-Hai Deng
DOI:10.1002/adsc.201800810
日期:2018.12.21
nitrogen‐containing quaternarycarboncenter catalyzed by cheap and readily available iron salt FeCl2, and affords a series of α‐amino‐β‐naphthalenones in good to excellent yields under simple and mild reaction conditions. Preliminary experimental and computational studies suggest that the reaction is probably initiated by iron‐iminyl diradical and followed by intramolecular hydrogen transfer to generate iron‐aminyl
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。
Catalytic Regiodivergent Dearomatization Reaction of Nitrosocarbonyl Intermediates with β-Naphthols
reported. In the presence of quinidine catalyst, their reactions with α-unsubstituted β-naphthols proceeded through the N-center to furnish α-imino-β-naphthalenones in high yields. Upon exposure to α-substituted β-naphthols in the presence of copper catalyst, an alteration of regioselectivity was observed to produce α-aminoxylation products. The reaction is scalable, tolerates a wide spectrum of functional
Catalytic asymmetric aminative dearomatization of 1‐substituted 2‐naphthols was successfully implemented with electrophilic azodicarboxylates under the catalysis of chiral ScIII/pybox complexes. This intermolecular reaction represents a hitherto unknown enantioselective CN bond‐forming process through direct dearomatization of phenolic compounds to generate chiral nitrogen‐containing quaternary carbon
在手性Sc III / pybox配合物的催化下,亲电的偶氮二羧酸酯成功地实现了1-取代的2-萘酚的催化不对称胺化脱芳香化反应。这种分子间反应是通过酚类化合物直接脱芳香化反应生成手性含氮季碳立体中心而形成的迄今未知的对映选择性CN键形成过程。