Ruthenium–NHC–Diamine Catalyzed Enantioselective Hydrogenation of Isocoumarins
作者:Wei Li、Mario P. Wiesenfeldt、Frank Glorius
DOI:10.1021/jacs.6b13124
日期:2017.2.22
A novel and practical chiral ruthenium-NHC-diamine system is disclosed for the enantioselective hydrogenation of isocoumarins, which provides a new concept to apply (chiral) NHC ligands in asymmetriccatalysis. A variety of optically active 3-substituted 3,4-dihydroisocoumarins were obtained in excellent enantioselectivities (up to 99% ee). Moreover, this methodology was utilized in the synthesis of
Copper nanoparticles catalyzed economical synthesis of 3-substituted isocoumarins from 2-chlorobenzoic acids/amides and 1,3-diketones
作者:Xiaowen Wang、Chaolong Wu、Youwen Sun、Xiaoquan Yao
DOI:10.1016/j.tetlet.2017.07.001
日期:2017.8
Copper nanoparticles were utilized as a highly efficient catalyst for a facile and economical synthesis of 3-substituted isocoumarins with 2-chlorobenzoic acids and 1,3-diketones as starting materials. The copper nanoparticles catalyst showed highly catalytic activity for the 2-chloro-substituted substrates to afford 3-substituted isocoumarins in good to excellent yields. Furthermore, good catalytic
A new protocol for the synthesis of polysubstituted isocoumarins from 2-iodobenzoic acid and beta-diketone compounds has been developed. The occurrence of C-arylation cyclization reaction in transition-metal-free systems and ortho-induced substrates has been exploited. Reactions using these inexpensive conditions have displayed high functional group tolerance and excellent yields. (c) 2012 Elsevier Ltd. All rights reserved.
Aryl iodine-catalysed divergent synthesis of isobenzofuranones and isocoumarins <i>via</i> oxidative 1,2-aryl migration/elimination
作者:Jiaxin He、Jingran Zhang、Xuemin Li、Haofeng Shi、Yunfei Du
DOI:10.1039/d2cc03101a
日期:——
The divergent synthesis of isobenzofuranones and isocoumarins was realized from the reaction of 2-alkenyl benzoic acids and mCPBA in the presence of catalytic aryl iodine and (±)-10-camphorsulfonic acid (CSA). The organocatalytic oxidative reaction is assumed to undergo a cascade process involving lactonization, 1,2-aryl migration and elimination enabled by a modified Koser reagent generated in situ