Cu(II)-Mediated Aminooxygenation of Alkenylimines and Alkenylamidines with TEMPO
摘要:
A method for the synthesis of oxymethyl dihydropyrroles (pyrrolines) and dihydroimidazoles has been developed via Cu(II)-mediated intramolecular aminooxygenation of alkenylimines and alkenylamidines, respectively, with 2,2,6,6-tetramethyl-1-piperidinyloxy radical (TEMPO).
N,N′-Dibenzosuberyl-1,1′-Binaphthyl-2,2′-diamine: A Highly Effective Supporting Ligand for the Enantioselective Cyclization of Aminoalkenes Catalyzed by Chelating Diamide Complexes of La(III) and Y(III)
作者:Tom Livinghouse、Khoi Huynh、Helena Lovick
DOI:10.1055/s-0033-1340186
日期:——
Enantioselective hydroamination/cyclization of representative aminoalkenes catalyzed by chelating diamide complexes of La(III) and Y(III) are described. It is noteworthy that the La(III) complex derived from the sterically demanding ( R )- N , N ′-dibenzosuberyl-1,1′-binaphthyl-2,2′-diamine proligand provides enantioselectivities that are in many cases significantly higher than those obtained with
Palladium(II)‐Catalyzed Aminotrifluoromethoxylation of Alkenes: Mechanistic Insight into the Effect of
<i>N</i>
‐Protecting Groups
作者:Chaohuang Chen、Chuanqi Hou、Pinhong Chen、Guosheng Liu
DOI:10.1002/cjoc.201900516
日期:2020.4
An efficientpalladium‐catalyzed regioselective 5‐exo aminotrifluoromethoxylation of alkenes has been established herein, which provides a practical route towards the synthesis of OCF3‐containing pyrrolidines. tert‐Butyloxycarbonyl (Boc) as an amino protectinggroup plays a significant role in both the chemo‐ and regioselectivities. In addition, preliminary mechanistic studies reveal that the amino
Regioselective Copper(II)-Mediated Bromoamination of Unfunctionalized Olefins: An Efficient Route to N-Heterocyclic Compounds
作者:Gong-Qing Liu、Zhen-Ying Ding、Li Zhang、Ting-Ting Li、Lin Li、Lili Duan、Yue-Ming Li
DOI:10.1002/adsc.201301125
日期:2014.7.7
Bromoamination of unfunctionalized olefins was realized under mild conditions using copper(II) bromide (CuBr2) as both reaction promoter and bromine source. The reactions could be carried out under open air at ambient temperature, and both N‐alkylated and N‐tosylated substrates could be converted to the corresponding N‐heterocyclic compounds in high regioselectivity and good isolated yields. A variety
Asymmetric Palladium-Catalyzed Aminochlorination of Unactivated Alkenes
作者:Zhigang Wang、Chuanqi Hou、Pinhong Chen
DOI:10.1021/acs.orglett.3c00771
日期:2023.4.21
A novel Pd-catalyzed enantioselective aminochlorination of alkenes via a 6-endo cyclization is reported herein, which provides easy access to a wide array of structurally diverse 3-chloropiperidines in good yields with excellent enantioselectivities. Notably, both an electrophilic chlorination reagent (NCS) and the sterically bulky chiral pyridinyl-oxazoline (Pyox) ligand are crucial to the successful