Cationic Cobalt(III) Catalyzed Indole Synthesis: The Regioselective Intermolecular Cyclization of N-Nitrosoanilines and Alkynes
作者:Yujie Liang、Ning Jiao
DOI:10.1002/anie.201511002
日期:2016.3.14
regioselectivity and reactivity of cobalt(III) in the direct cyclization of N‐nitrosoanilines with alkynes for the expedient synthesis of N‐substituted indoles is demonstrated. In the presence of a cobalt(III) catalyst, high regioselectivity was observed when using unsymmetrical meta‐substituted N‐nitrosoanilines. Moreover, internal alkynes bearing electron‐deficient groups, which are almost unreactive
证明了钴(III)在N-亚硝基苯胺与炔烃的直接环化中独特的区域选择性和反应性,可方便地合成N-取代的吲哚。在钴(III)催化剂存在下,当使用不对称的间位取代的N-亚硝基苯胺时,观察到较高的区域选择性。此外,带有缺电子基团的内部炔烃在[Cp * Rh III ]催化的体系中几乎没有反应性,在这种转变中表现出良好的反应性。
Accessing 1,3-Dienes via Palladium-Catalyzed Allylic Alkylation of Pronucleophiles with Skipped Enynes
作者:Shang Gao、Hao Liu、Chi Yang、Zhiyuan Fu、Hequan Yao、Aijun Lin
DOI:10.1021/acs.orglett.7b01960
日期:2017.9.15
An unprecedented palladium-catalyzed allylic alkylation of pronucleophiles with unactivated skipped enynes has been developed. This method provides a straightforward access to a wide array of 1,3-dienes without the need to preinstall leaving groups or employ extra oxidants. The reaction exhibited high atom economy, good functional group tolerance, excellent regioselectivities, and scalability. With
Asymmetric α-Allylation of Aldehydes with Alkynes by Integrating Chiral Hydridopalladium and Enamine Catalysis
作者:Yong-Liang Su、Lu-Lu Li、Xiao-Le Zhou、Zhen-Yao Dai、Pu-Sheng Wang、Liu-Zhu Gong
DOI:10.1021/acs.orglett.8b00740
日期:2018.4.20
A palladium-catalyzed asymmetric α-allylation of aldehydes with alkynes has been established by integrating the catalysis of enamine and chiral hydridopalladium complex that is reversibly formed from the oxidative addition of Pd(0) to chiral phosphoric acid. The ternary catalyst system, consisting of an achiral palladium complex, a primary amine, and a chiral phosphoric acid allows the reaction to
enantioselective proton migration from skipped enynes to allenes as an efficient approach in chiral allenesynthesis. With catalyst loading as low as 0.5 mol %, the reaction proceeds smoothly under mild conditions without the need for additional stoichiometric reagents or generation of waste. Novel chiral ligand L6 plays a critical role in furnishing high catalyst activity, promoting regioselective protonation
A Copper(I)-Mediated Tandem Three-Component Synthesis of 5-Allyl-1,2,3-triazoles
作者:Yoona Song、Soyun Lee、Palash Dutta、Jae-Sang Ryu
DOI:10.1055/s-0039-1691506
日期:2020.3
A copper(I)-mediated tandem three-component reaction using alkynes, azides, allyl iodides, CuI and NaNH2 is developed. The reactions proceed smoothly at room temperature to afford 5-allyl-1,2,3-triazoles, which can be further converted into 1,2,3-triazole-fused tricyclic scaffolds. This method features an efficient one-pot cascade route using commercial alkynes and affords the corresponding 5-allyl-1