Position-Addressable Nano-Scaffolds. I. The Preparation of N,O-, N,C- and N,N-Bridged Sesquinorbornadiene Succinimides as Compact, Highly Functionalized Addressable Building Blocks
Position-Addressable Nano-Scaffolds. I. The Preparation of N,O-, N,C- and N,N-Bridged Sesquinorbornadiene Succinimides as Compact, Highly Functionalized Addressable Building Blocks
Palladium/Lewis Acid Cocatalyzed Reductive Asymmetric Ring-Opening Reaction of Azabenzonorbornadienes with Tertiary Amines as the Hydrogen Source
作者:Dapeng Zhang、Ruhima Khan、Fan Yang、Xuexin Zhang、Guoli Shen、Yang Gao、Ruifeng Fan、Weiqing Sun、Baomin Fan
DOI:10.1002/ejoc.201800503
日期:2018.7.13
Palladium and silver cocatalyzed the asymmetric transfer hydrogenation of azabenzonorbornadienes with tertiary amines to give the corresponding ring‐opening products in high yields with good to excellent enantioselectivities. (R)‐2,2′‐Bis(diphenylphosphino)‐1,1′‐binaphthyl [(R)‐BINAP] and para‐methoxybenzoic acid were used as the chiral ligand and additive, respectively, in the reported protocol.
Asymmetric Transfer Hydrogenation of Heterobicyclic Alkenes with Water as Hydrogen Source
作者:Guoli Shen、Jingchao Chen、Dandan Xu、Xia Zhang、Yongyun Zhou、Baomin Fan
DOI:10.1021/acs.orglett.9b00059
日期:2019.3.1
The asymmetric transfer hydrogenation of heterobicyclic alkenes was accomplished by using water as the sole hydrogensource. The transformation was co-catalyzed by Pd(OAc)2/Zn(OTf)2 dual catalyst with metallic zinc as reducing agent. Various azabenzonorbornadienes and oxabenzonorbornadienes were transformed to the corresponding chiral 1,2-dihydronaphthalenes by the asymmetric reductive ring-opening
A Readily Accessible Class of Chiral Cp Ligands and their Application in Ru
<sup>II</sup>
‐Catalyzed Enantioselective Syntheses of Dihydrobenzoindoles
作者:Shou‐Guo Wang、Sung Hwan Park、Nicolai Cramer
DOI:10.1002/anie.201802244
日期:2018.5.4
Chiral cyclopentadienyl (Cpx) ligands have a large application potential in enantioselective transition‐metal catalysis. However, the development of concise and practical routes to such ligands remains in its infancy. We present a convenient and efficient two‐step synthesis of a novel class of chiral Cpx ligands with tunable steric properties that can be readily used for complexation, giving CpxRhI
手性环戊二烯(Cp x)配体在对映选择性过渡金属催化中具有巨大的应用潜力。但是,开发这种配体的简洁实用的方法仍处于起步阶段。我们提出了一种方便有效的两步合成具有可调空间特性的新型手性Cp x配体的方法,可以很容易地用于络合,得到Cp x Rh I,Cp x Ir I和Cp x Ru II复合体。后者在用炔烃对氮杂苯并降冰片二烯进行对映选择性环化中得到了证明,后者可提供高达98:2 er的二氢苯并吲哚,显着优于现有的由双萘基衍生的Cp x配体。
Nickel-Catalyzed Asymmetric [2+2] Cycloaddition Reaction of Hetero-Bicyclic Alkenes with Internal Alkynes
作者:Hongyu Qin、Jingchao Chen、Kangkui Li、Zhenxiu He、Yongyun Zhou、Baomin Fan
DOI:10.1002/asia.201800492
日期:2018.9.4
Enantioselective [2+2] cycloaddition reaction of azabenzonorbornadienes and oxabenzonorbornadienes with internal alkynes has been enabled by a catalyst system comprising Ni(COD)2 and (R)‐SIPHOS‐Ph‐Mor. This transformation represents the first asymmetric [2+2] cycloaddition reaction of azabenzonorbornadienes with internal alkynes, providing a straightforward method to prepare four‐membered carbocycles
Rhodium-Catalyzed Asymmetric Arylative Ring-Opening Reactions of Heterobicyclic Alkenes with Anilines
作者:Jingchao Chen、Lingling Zou、Chaoyuan Zeng、Yongyun Zhou、Baomin Fan
DOI:10.1021/acs.orglett.7b03941
日期:2018.3.2
ring-opening reactions of heterobicyclic alkenes with anilines have been reported for the first time. A wide range of heterobicyclic alkenes, including azabenzonorbornadienes and oxabenzonorbornadienes, were well tolerated in the reaction with various anilines, and they generally delivered the corresponding chiral aryltetralin derivatives in good to excellent enantioselectivities. The reaction is speculated