Aerobic Oxidation/Annulation Cascades through Synergistic Catalysis of RuCl<sub>3</sub>
and N-Heterocyclic Carbenes
作者:Qian Wang、Jiean Chen、Yong Huang
DOI:10.1002/chem.201803254
日期:2018.9.3
Cooperative catalysis combining a transition metal with an N‐heterocyclic carbene is challenging due to strong binding of NHCstowards late transition metals. We report the first example of synergistic catalysis by a chiral NHC and a coordinatively unsaturated ruthenium compound. RuCl3 was found to mediate efficient aerobic oxidation of homoenolates generated from enals and the N‐heterocyclic carbene
aerobic asymmetric cyclization reaction of cinnamaldehydes and 1,3-dicarbonylcompounds through oxidative NHC-catalysis has been developed, and it allows the synthesis of a wide range of enantiomeric enriched dihydropyranone derivatives in good yields with good to excellent enantioselectivities. Various α,β-unsaturated aldehydes with aliphatic and aromatic substitution groups and 1,3-dicarbonyl compounds
Asymmetric aerobic oxidative NHC-catalysed synthesis of dihydropyranones utilising a system of electron transfer mediators
作者:A. Axelsson、E. Hammarvid、L. Ta、H. Sundén
DOI:10.1039/c6cc06060a
日期:——
Enantioselective synthesis of dihydropyranones via aerobic multistep electron transfer NHC catalysis. Selective introduction of O2 as the terminal oxidant.
Enantioselective N-Heterocyclic Carbene-Catalyzed Annulations of 2-Bromoenals with 1,3-Dicarbonyl Compounds and Enamines<i>via</i>Chiral α,β-Unsaturated Acylazoliums
作者:Santhivardhana Reddy Yetra、Anup Bhunia、Atanu Patra、Manoj V. Mane、Kumar Vanka、Akkattu T. Biju
DOI:10.1002/adsc.201300219
日期:2013.4.15
The N‐heterocyclic carbene (NHC)‐catalyzed generation of chiral α,β‐unsaturated acylazoliums from 2‐bromoenals followed by their interception with 1,3‐dicarbonyl compounds or enamines, the formal [3+3] annulation reaction, is reported. The reaction results in the enantioselective synthesis of synthetically and medicinally important dihydropyranones and dihydropyridinones, and tolerates a wide range