catalytic methods for the oxidative furan-recyclizations remain scarcely investigated. Given this, we report a means of manganese-catalyzed oxidations of furan with low loading, achieving the Achmatowiczrearrangement in the presence of hydrogen peroxide as an environmentally benign oxidant under mild conditions with wide functional group compatibility.
Diversity-Oriented Synthesis of Drug-Like Macrocyclic Scaffolds Using an Orthogonal Organo- and Metal Catalysis Strategy
作者:André Grossmann、Sean Bartlett、Matej Janecek、James T. Hodgkinson、David R. Spring
DOI:10.1002/anie.201406865
日期:2014.11.24
diversity‐generating organocatalytic steps with alkene metathesis enabled the synthesis of 51 distinct macrocyclic structures bearing 48 unique scaffolds in only two to four steps without the need for protecting groups. Furthermore, merging organocatalysis and alkene metathesis in a one‐pot protocol facilitated the synthesis of drug‐like macrocycles with natural‐product‐like levels of shape diversity in a single
Combined Computational and Experimental Study on [5 + 2] Cycloaddition of 2-Trifluoromethylated Oxidopyrylium Species Leading to 1-(Trifluoromethyl)-8-oxabicyclo[3.2.1]oct-3-en-2-ones
furfural using the Ruppert–Prakash reagent (TMSCF3) and subsequent photo-Achmatowicz reaction afforded 6-hydroxy-2-(trifluoromethyl)-2H-pyran-3(6H)-one. After acetylation, the resultant 6-acetoxy-2-(trifluoromethyl)-2H-pyran-3(6H)-one was transformed into various 1-(trifluoromethyl)-8-oxabicyclo[3.2.1]oct-3-en-2-one derivatives through a base-mediated oxidopyrylium [5 + 2] cycloaddition. The reactivity and
PROCESS FOR THE PREPARATION OF 2,5-FURANDICARBOXYLIC ACID (FDCA) BY OXIDATION OF 5-(HYDROXYMETHYL)FURFURAL (HMF) OR 5-(ALKYLOXYMETHYL)FURFURAL (AMF) WITH OXYGEN IN THE PRESENCE OF A CO(II) OR CE(III) CATALYST, A BROMIDE SALT AND A SOLVENT
申请人:Archer Daniels Midland Company
公开号:EP3133064A1
公开(公告)日:2017-02-22
A process for the preparation of 2,5-furandicarboxylic acid (FDCA) by oxidation of 5-(hydroxymethyl)furfural (HMF) or 5-(alkyloxymethyl)furfural (AMF) with oxygen in the presence of a Co(II) or Ce(III) catalyst, a bromide salt and a solvent.
AMF is oxidized to the intermediate compound 5-(alkoxycarbonyl)furancarboxylic acid (AcMFA), which is then hydrolysed to FDCA.
The process is carried out preferably at T=80-130 °C and 800-1000 psi.
Acetic acid is the preferred solvent.