Sequential Birch reaction and asymmetric Ir-catalyzed hydrogenation as a route to chiral building blocks
作者:Alexander Paptchikhine、Kaori Itto、Pher G. Andersson
DOI:10.1039/c0cc05619g
日期:——
A range of 1,2,4-trisubstituted cyclohexadienes obtained from the Birch reaction were hydrogenated asymmetrically to produce synthetically valuable chiral compounds in high enantio- and diastereoselectivity.
Iridium(III)‐Catalyzed Intermolecular C(sp
<sup>3</sup>
)−H Insertion Reaction of Quinoid Carbene: A Radical Mechanism
作者:Hai‐Xu Wang、Yann Richard、Qingyun Wan、Cong‐Ying Zhou、Chi‐Ming Che
DOI:10.1002/anie.201911138
日期:2020.1.27
intermolecular C(sp3 )-H insertion reaction of a quinoid carbene (QC). The reaction was designed by harnessing the hydrogen-atom transfer (HAT) reactivity of a metal-QC species with aliphatic substrates followed by a radical rebound process to afford C-H arylation products. This methodology is efficient for the arylation of activated hydrocarbons such as 1,4-cyclohexadienes (down to 40 min reaction time, up
Enantio- and Regioselective Ir-Catalyzed Hydrogenation of Di- and Trisubstituted Cycloalkenes
作者:Byron K. Peters、Jianguo Liu、Cristiana Margarita、Wangchuk Rabten、Sutthichat Kerdphon、Alexander Orebom、Thomas Morsch、Pher G. Andersson
DOI:10.1021/jacs.6b07291
日期:2016.9.14
carbons away from the olefin. Substrates having functionalities such as carboxyl groups, alcohols, or heterocycles in the vicinity of the C═C bond were hydrogenated in high enantiomeric excess (up to >99% ee). The hydrogenation was also found to be regioselective, and by controlling the reaction conditions, selective hydrogenation of one of two trisubstituted olefins can be achieved. Furthermore, trisubstituted
Birch reaction products are asymmetrically hydrogenated with high enantio- and diastereoselectivity via iridium catalysts. This new method of producing chiral compounds was explored for a variety of 1,3-di- and 1,2,4-tri-substituted cyclohexadienes.