Design of Ru(II)-NHC-Diamine Precatalysts Directed by Ligand Cooperation: Applications and Mechanistic Investigations for Asymmetric Hydrogenation
作者:Wei Li、Tobias Wagener、Lars Hellmann、Constantin G. Daniliuc、Christian Mück-Lichtenfeld、Johannes Neugebauer、Frank Glorius
DOI:10.1021/jacs.0c00985
日期:2020.4.15
A modular synthesis of Ru(II)-NHC-diamine complexes from readily available chiral N-heterocyclic carbenes (NHCs) and chiraldiamines is disclosed for the first time. The well-defined Ru(II)-NHC-diamine complexes show unique structure and coordination chemistry including an unusual tridentate coordination effect of 1,2-diphenylethylenediamine. The isolated air- and moisture-stable Ru(II)-NHC-diamine
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.