AbstractThe paper describes the oxidative Heck arylation of various allylic amines using arylboronic acids for the preparation of tetrasubstituted alkenes. As oxidant the commercially available 2,2,6,6‐tetramethylpiperidine‐N‐oxyl (TEMPO) is used and coupling reactions occur under very mild conditions at room temperature. The densely substituted alkenes are formed in good to excellent yields with complete control of the diastereoselectivity. Substrate scope with respect to the allylic amine and the arylboronic acid is investigated.magnified image
AbstractThe paper describes the oxidative Heck arylation of various allylic amines using arylboronic acids for the preparation of tetrasubstituted alkenes. As oxidant the commercially available 2,2,6,6‐tetramethylpiperidine‐N‐oxyl (TEMPO) is used and coupling reactions occur under very mild conditions at room temperature. The densely substituted alkenes are formed in good to excellent yields with complete control of the diastereoselectivity. Substrate scope with respect to the allylic amine and the arylboronic acid is investigated.magnified image
Palladium‐Catalyzed, Chelation‐Assisted Stereo‐ and Regioselective Synthesis of Tetrasubstituted Olefins by Oxidative Heck Arylation
作者:Hyun Seung Lee、Ko Hoon Kim、Sung Hwan Kim、Jae Nyoung Kim
DOI:10.1002/adsc.201200306
日期:2012.9.17
An efficient synthesis of tetrasubstitutedolefins was achieved via a palladium‐catalyzed, chelation‐assisted oxidativeHeckarylation protocol from trisubstituted olefins bearing a tether with a directing group in a completely stereo‐ and regioselective manner. The stereo‐ and regioselectivity as well as excellent yields of tetrasubstitutedolefins originated from the stabilization of a palladium
Oxidative Heck Coupling of Allylic Amines with 2,2,6,6‐Tetramethylpiperidine‐
<i>N</i>
‐oxyl (TEMPO) as Oxidant for the Preparation of Tetrasubstituted Alkenes
作者:Zhiheng He、Birgit Wibbeling、Armido Studer
DOI:10.1002/adsc.201300846
日期:2013.12.16
AbstractThe paper describes the oxidative Heck arylation of various allylic amines using arylboronic acids for the preparation of tetrasubstituted alkenes. As oxidant the commercially available 2,2,6,6‐tetramethylpiperidine‐N‐oxyl (TEMPO) is used and coupling reactions occur under very mild conditions at room temperature. The densely substituted alkenes are formed in good to excellent yields with complete control of the diastereoselectivity. Substrate scope with respect to the allylic amine and the arylboronic acid is investigated.magnified image