亲核铁配合物Bu4 N [Fe(CO)3(NO)](TBA [Fe])在CH胺化反应中也是质子转移催化中的活性催化剂。在本文中,我们描述了该复合物作为质子转移催化剂在叠氮化物和酮与相应的1,2,3-三唑之间的环缩合反应中的成功应用。交叉实验表明,质子转移催化显着快于腈转移催化,这将导致生成CH胺化产物。给出了成功地将Dimroth三唑-二氢吲哚成功合成为相应的三唑取代的二氢吲哚的实例。
Nucleophile Coordination Enabled Regioselectivity in Palladium‐Catalyzed Asymmetric Allylic C−H Alkylation
作者:Lian‐Feng Fan、Shi‐Wei Luo、Shu‐Sen Chen、Tian‐Ci Wang、Pu‐Sheng Wang、Liu‐Zhu Gong
DOI:10.1002/anie.201908960
日期:2019.11.18
Branched selectivity in asymmetric allylic C-H alkylation is enabled by using 2-acylimidazoles as nucleophiles in the presence of a chiral phosphoramidite-palladium catalyst. A wide range of terminal alkenes, including 1,4-dienes and allylarenes, are nicely tolerated and provide chiral 2-acylimidazoles in moderate to high yields and with high levels of regio-, and enantio-, and E/Z-selectivities. Mechanistic
Palladium-Catalyzed Enantioselective C(sp<sup>3</sup>)–H/C(sp<sup>3</sup>)–H Umpolung Coupling of <i>N</i>-Allylimine and α-Aryl Ketones
作者:Tian-Ci Wang、Ling Zhu、Shiwei Luo、Zhong-Sheng Nong、Pu-Sheng Wang、Liu-Zhu Gong
DOI:10.1021/jacs.1c10721
日期:2021.12.8
tolerated to open a convenient and tunable avenue for efficient synthesis of enantioenriched β-amino-γ,δ-unsaturated carbonyl derivatives with high levels of regio- and stereoselectivities, capable of providing a key intermediate for asymmetric synthesis of Focalin. This protocol showcases an umpolung reactivity of the N-allylimines through a concerted proton and two-electron transfer process to cleave
Asymmetric Allylic C–H Alkylation of Allyl Ethers with 2-Acylimidazoles
作者:Tian-Ci Wang、Lian-Feng Fan、Yang Shen、Pu-Sheng Wang、Liu-Zhu Gong
DOI:10.1021/jacs.9b05247
日期:2019.7.10
An asymmetricallylic C-H alkylation of allyl ethers has been established by chiral phosphoramidite-palladium catalysis, affording a wide variety of functionalized chiral 2-acylimidazoles in moderate to high yields and with high levels of enantioselectivity. Moreover, this protocol could be applied to a concise asymmetric synthesis of a tachykinin receptor antagonist.
method for constructing a series of fluorine-containing γ-keto acid derivatives through combining visible-light photoredox catalysis and chiral Lewis acid catalysis. With this dual catalytic strategy, a variety of chiral γ-keto amides containing a gem-difluoroalkyl group and a series of fluorine-containing α,β-unsaturated-γ-keto esters were successfully constructed with high stereoselectivities, respectively
Nucleophilic Iron Complexes in Proton‐Transfer Catalysis: An Iron‐Catalyzed Dimroth Cyclocondensation
作者:Aslihan Baykal、Dihan Zhang、Jakob Knelles、Isabel T. Alt、Bernd Plietker
DOI:10.1002/asia.201900821
日期:2019.9.2
The nucleophilic ironcomplex Bu4 N[Fe(CO)3 (NO)] (TBA[Fe]) is an active catalyst in C-H-amination but also in proton-transfer catalysis. Herein, we describe the successful use of this complex as a proton-transfer catalyst in the cyclocondensation reaction between azides and ketones to the corresponding 1,2,3-triazoles. Cross-experiments indicate that the proton-transfer catalysis is significantly
亲核铁配合物Bu4 N [Fe(CO)3(NO)](TBA [Fe])在CH胺化反应中也是质子转移催化中的活性催化剂。在本文中,我们描述了该复合物作为质子转移催化剂在叠氮化物和酮与相应的1,2,3-三唑之间的环缩合反应中的成功应用。交叉实验表明,质子转移催化显着快于腈转移催化,这将导致生成CH胺化产物。给出了成功地将Dimroth三唑-二氢吲哚成功合成为相应的三唑取代的二氢吲哚的实例。