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
Synthesis of Chiral 3-Alkyl-3,4-dihydroisocoumarins by Dynamic Kinetic Resolutions Catalyzed by a Baeyer−Villiger Monooxygenase
作者:Ana Rioz-Martínez、Gonzalo de Gonzalo、Daniel E. Torres Pazmiño、Marco W. Fraaije、Vicente Gotor
DOI:10.1021/jo902519j
日期:2010.3.19
Baeyer−Villigermonooxygenases have been tested in the oxidation of racemic benzofused ketones. When employing a single mutant of phenylacetone monooxygenase (M446G PAMO) under the proper reaction conditions, it was possible to achieve 3-substituted 3,4-dihydroisocoumarins with high yields and optical purities through regioselective dynamic kinetic resolution processes.
Finding the best catalyst: A set of P450 BM3 variants was tested for stereoselectivehydroxylation of benzoic acid derivatives, with the goal of synthesizing phthalides and isocoumarins. We obtained variants giving access to R‐ and S‐configured products constituting a new route to a class of compounds that are valuable synthons for a variety of natural products.
Diastereoselectivity in chiral (arene)tricarbonylchromium homobenzylic alcohol complexes: asymmetric synthesis of dihydroisocoumarins
作者:Rasiah Thangarasa、James R. Green、T. Timothy Nadasdi
DOI:10.1039/c39940000501
日期:——
Enantiomerically pure (arene)tricarbonylchromiumcomplexes of homobenzylic ketones 3 undergo stereoselective reduction to give the corresponding alcohols, which may be transformed readily into enantiomerically pure dihydroisocoumarins.