A highly efficient and practical method for the synthesis of primary propargylic alcohols has been developed using CuI as catalyst and paraformaldehyde as the formaldehyde source. The reaction was performed under mild reaction conditions offering the desired products in good to excellent yields with a variety of terminal alkynes.
Chiral Brønsted Acid Catalyzed Enantioselective Dehydrative Nazarov-Type Electrocyclization of Aryl and 2-Thienyl Vinyl Alcohols
作者:Jianwen Jin、Yichao Zhao、Ali Gouranourimi、Alireza Ariafard、Philip Wai Hong Chan
DOI:10.1021/jacs.8b02339
日期:2018.5.2
An efficient chiral Brønsted acid-catalyzed enantioselective dehydrative Nazarov-type electrocyclization (DNE) of electron-rich aryl- and 2-thienyl-β-amino-2-en-1-ols is described. The 4π conrotatory electrocyclization reaction affords access to a wide variety of the corresponding 1 H-indenes and 4 H-cyclopenta[ b]thiophenes in excellent yields of up to 99% and enantiomeric excess (ee) values of up
Synthesis of 2-arylindole derivatives and evaluation as nitric oxide synthase and NFκB inhibitors
作者:Xufen Yu、Eun-Jung Park、Tamara P. Kondratyuk、John M. Pezzuto、Dianqing Sun
DOI:10.1039/c2ob26456k
日期:——
small molecule drug-like inhibitors blocking both nitricoxide synthase and NFκB could offer a synergistic therapeutic approach in the prevention and treatment of inflammation and cancer. During the course of evaluating the biological potential of a commercial compound library, 2-phenylindole (1) displayed inhibitory activity against nitrite production and NFκB with IC50 values of 38.1 ± 1.8 and 25.4
A phosphane‐catalyzed [3+3] annulation of azomethineimines with ynones has been developed. Under mild reaction conditions, the reaction proceeds smoothly to afford tricyclic dinitrogen‐fused heterocyclic compounds in moderate to excellent yields with moderate to excellent stereoselectivies. Using a chiral phosphine as the catalyst, the reaction could work to give the cycloadduct in moderate yield
Visible-light induced copper(<scp>i</scp>)-catalysed denitrogenative oxidative coupling of hydrazinylpyridines with terminal alkynes
作者:Vaibhav Pramod Charpe、Aniket A. Hande、Arunachalam Sagadevan、Kuo Chu Hwang
DOI:10.1039/c8gc01180j
日期:——
Visible light mediated copper catalysed denitrogenative oxidative coupling of 2-hydrazinopyridines with terminal alkynes to form 2-(alkyl/arylethynyl) pyridines in the presence of O2 at room temperature is reported with 42 examples. This is the first report on visible light stimulated N2 elimination by an in situ generated copper(II) superoxo/peroxo complex. N2 and water are the only by-products. The