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
The Rh(III)-catalyzed C–H activation initiated cyclization of benzoicacids with electron-rich geminal-substituted vinyl acetates was described. The reaction was employed to prepare a range of 3-aryl and 3-alkyl substituted isocoumarins selectively.
Pd-Catalyzed/Iodide-Promoted α-Arylation of Ketones for the Regioselective Synthesis of Isocoumarins
作者:Alessandra Casnati、Raimondo Maggi、Giovanni Maestri、Nicola Della Ca’、Elena Motti
DOI:10.1021/acs.joc.7b01355
日期:2017.8.4
synthesized directly from 2-halobenzoates and ketones through a palladium-catalyzed α-arylation step followed by an intramolecular cyclization process. The addition of iodide anions to the reaction mixture increased yields and selectivities especially when 2-bromobenzoates were employed. This phosphine-free one-potsynthesis features a high functional group tolerance and gives access to richly decorated
Synthesis of Isocoumarin Derivatives via the Copper-Catalyzed Tandem Sequential Cyclization of 2- Halo-<i>N</i>-phenyl Benzamides and Acyclic 1,3-Diketones
作者:Veerababurao Kavala、Cheng-Chuan Wang、Deepak Kumar Barange、Chun-Wei Kuo、Po-Min Lei、Ching-Fa Yao
DOI:10.1021/jo300501j
日期:2012.6.1
A facile and rapid synthesis of isocoumarin derivatives using a copper-catalyzed tandem C–C/C–O coupling strategy from readily available substrates is described. The reactions of a wide range of 2-iodo-N-phenyl benzamides and acyclic diketones as starting materials were investigated.