Supramolecular Control of Selectivity in Hydroformylation of Vinyl Arenes: Easy Access to Valuable β-Aldehyde Intermediates
作者:Paweł Dydio、Joost N. H. Reek
DOI:10.1002/anie.201209582
日期:2013.4.2
flow! A rationally designed regioselective hydroformylation catalyst, [Rh/L], in which noncovalent ligand–substrate interactions allow the unprecedented reversal of selectivity from the typical α‐aldehyde to the otherwise unfavored product β‐aldehyde, is reported. This catalytic system opens up novel and sustainable synthetic pathways to important intermediates for the fine‐chemicals industry.
Beyond Classical Reactivity Patterns: Hydroformylation of Vinyl and Allyl Arenes to Valuable β- and γ-Aldehyde Intermediates Using Supramolecular Catalysis
作者:Paweł Dydio、Remko J. Detz、Bas de Bruin、Joost N. H. Reek
DOI:10.1021/ja503033q
日期:2014.6.11
regioselective hydroformylation of vinyl and allyl arenes bearing an anionic group. In principle, the binding site of the ligand is used to preorganize a substrate molecule through noncovalent interactions with its anionic group to promote otherwise unfavorable reaction pathways. We demonstrate that this strategy allows for unprecedented reversal of selectivity to form otherwise disfavored β-aldehyde products
activity among carbonyl compounds leading to various competitive side reactions. Herein we reported an efficient Pd-catalyzed asymmetric intermolecular α-arylation reaction of α-alkyl-α-aryl disubstituted aldehydes with aryl bromides, which provides a rapid access to chiralaldehydes bearing an α-all-carbon quaternary stereocenter in moderate to good yields with good er in most cases. In addition, a pair
This article describes the thermally accelerated organocatalyticα-amination of disubstitutedaldehydes with azodicarboxylates under microwave conditions. Compared to the results previously obtained at room temperature, both yield and enantioselectivity could be significantly increased. Employing microwave irradiation resulted in a considerably reduced reaction time. Therefore, this improved protocol
Construction of Acyclic All‐Carbon Quaternary Stereocenters and 1,3‐Nonadjacent Stereoelements via Organo/Metal Dual Catalyzed Asymmetric Allenylic Substitution of Aldehydes
A novel synthetic strategy for the asymmetric allenylic substitution of aldehydes, which enables the construction of allene-containing acyclic all-carbonquaternarystereocenters and 1,3-nonadjacent stereoelements, has been reported.