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
Study on the ArI-catalyzed intramolecular <i>oxy</i>-cyclization of 2-alkenylbenzamides to benzoiminolactones
作者:Huixia Liu、Xiaojun Deng、Xie Huang、Nan Ji、Wei He
DOI:10.1039/d0ob00612b
日期:——
A metal-free synthetic method toward the preparation of benzoiminolactones through oxy-cyclization of 2-alkenylbenzamides mediated by a catalyst/oxidant (ArI/mCPBA) system was developed.
works efficiently, promoted by BF3·OEt2 with the insertion of sulfur dioxide under mild conditions, leading to sulfonated 1-isoindolinones in moderate to good yields. This route is highly selective, and several competitivepathways are not observed under these conditions. A possible mechanism involving photocatalysis and a Lewis acid is proposed.
Nickel-Catalyzed Reductive 1,2-Dialkynylation of Alkenes Bearing an 8-Aminoquinoline Directing Group
作者:Rui Pan、Cong Shi、Dongquan Zhang、Yang Tian、Songjin Guo、Hequan Yao、Aijun Lin
DOI:10.1021/acs.orglett.9b03147
日期:2019.11.15
An unprecedented nickel-catalyzed reductive 1,2-dialkynylation of alkenes bearing an 8-aminoquinoline directing group has been developed. This method proceeded through a migratory insertion/reductive-coupling process under mild conditions with a wide substrate scope and good functional group tolerance, providing direct access to the synthetically flexible 1,5-diynes. Moreover, the 1,2-dialkynylation products could be further converted to borate-ester- or azide-functionalized 1,5-dienes, ditriazole, beta-diyne primary amide, and trisubstituted benzene.