Enantioselective Synthesis of Tertiary Alcohols through a Zirconium-Catalyzed Friedel–Crafts Alkylation of Pyrroles with α-Ketoesters
作者:Gonzalo Blay、Isabel Fernández、M. Carmen Muñoz、José R. Pedro、Alejandro Recuenco、Carlos Vila
DOI:10.1021/jo2010704
日期:2011.8.5
Chiral complexes of 1,1′-bi-2-naphthol-based ligands with zirconium tert-butoxide catalyze the Friedel–Craftsalkylation of pyrroles with α-ketoesters to afford tertiary alcohols in good yields and ee up to 98%. The reaction is also of application to 4,7-dihydroindole to give C2-alkylated indoles after oxidation with p-benzoquinone.
Enantioselective addition of nitromethane to α-keto esters catalyzed by copper(<scp>ii</scp>)–iminopyridine complexes
作者:Gonzalo Blay、Victor Hernández-Olmos、José R. Pedro
DOI:10.1039/b716446g
日期:——
The coppercomplex of a chiral iminopyridine easily prepared from (R)-(-)-fenchone and picolylamine catalyzes the enantioselective Henry (nitroaldol) reaction between nitromethane and alpha-keto esters. Good yields and modest to good enantioselectivities are obtained for a wide range of alpha-keto esters, bearing aromatic, alkyl or alkenyl groups attached to the ketone carbonyl group.
Synthesis of Donor/Acceptor-Substituted Diazo Compounds in Flow and Their Application in Enantioselective Dirhodium-Catalyzed Cyclopropanation and C–H Functionalization
作者:Daniel Rackl、Chun-Jae Yoo、Christopher W. Jones、Huw M. L. Davies
DOI:10.1021/acs.orglett.7b01073
日期:2017.6.16
A tandem reaction system has been developed for the preparation of donor/acceptor-substituted diazo compounds in continuous flow coupled to dirhodium-catalyzed C-H functionalization or cyclopropanation. Hydrazones were oxidized in flow by solid-supported N-iodo-p-toluenesulfonamide potassium salt (PS-SO2NIK) to generate the diazo compounds, which were then purified by passing through a column of molecular sieves/sodium thiosulfate.
An Immobilized‐Dirhodium Hollow‐Fiber Flow Reactor for Scalable and Sustainable C−H Functionalization in Continuous Flow
作者:Chun‐Jae Yoo、Daniel Rackl、Wenbin Liu、Caroline B. Hoyt、Brian Pimentel、Ryan P. Lively、Huw M. L. Davies、Christopher W. Jones
DOI:10.1002/anie.201805528
日期:2018.8.20
A scalable flow reactor is demonstrated for enantioselective and regioselective rhodium carbene reactions (cyclopropanation and C−H functionalization) by developing cascade reaction methods employing a microfluidic flow reactor system containing immobilized dirhodiumcatalysts in conjunction with the flow synthesis of diazo compounds. This allows the utilization of the energetic diazo compounds in
Molecular Iodine Mediated Oxidation of Arylated α‐Carbonyl Sulfoxonium Ylides to 1,2‐Dicarbonyl‐Containing Compounds
作者:Radell Echemendía、Matheus P. De Jesus、Lucas G. Furniel、David Philip Day、Antonio C. B. Burtoloso
DOI:10.1002/ejoc.202200441
日期:2022.7.14
Iodine in action: A fast and efficient method to construct 1,2-dicarbonyl compounds from molecular Iodine and prochiral sulfoxonium ylides. A variety of decorated 1,2-dicarbonyl compounds were prepared with molecular iodine and aryl substituted sulfoxonium ylides.Molecular iodinemediatedoxidation of arylated α-carbonyl sulfoxonium ylides to 1,2-dicarbonyl containing compounds