Electrochemically induced Hofmannrearrangement under new solvent systems containing a variety of alcohols was developed. Since the reaction proceeds under mild conditions (neutral), a variety of carbamates possessing various alkoxy moieties could be easily prepared by this method. An epoxy functional group in the amide and alcohol parts remained intact during the electrolysis.
De Novo Synthesis of Troc-Protected Amines: Intermolecular Rhodium-Catalyzed C−H Amination with <i>N</i>-Tosyloxycarbamates
作者:Hélène Lebel、Kim Huard
DOI:10.1021/ol062953t
日期:2007.2.1
intermolecular C-Hinsertion of the nitrene derived from 2,2,2-trichloroethyl-N-tosyloxycarbamate proceeded in good to excellent yields to produce a variety of Troc-protected amines. With cyclic aliphatic alkanes, it is possible to use only 2 equiv of substrate, whereas the reaction with aromatic alkanes is run neat. Not only does the nitrene insertion proceed in benzylic, secondary, and tertiary C-H bonds
<i>N</i>‐Tosyloxycarbamates as Reagents in Rhodium‐Catalyzed CH Amination Reactions
作者:Kim Huard、Hélène Lebel
DOI:10.1002/chem.200702027
日期:2008.7.7
nitrenes for use in C-Hinsertion reactions were obtained from N-tosyloxycarbamates in the presence of an inorganic base and a rhodium(II) dimer complex catalyst. The C-H amination reaction proceeds smoothly, and the potassium tosylate that forms as a byproduct is easily removed by filtration or an aqueous workup. This new methodology allows the amination of ethereal, benzylic, tertiary, secondary
Process for producing fluorinated carbamates and isocyanates
申请人:Polo Ana Padilla
公开号:US20090082588A1
公开(公告)日:2009-03-26
The invention relates to a process for producing fluorinated carbamates comprising the reaction between an amine or polyamine and a fluorinated carbonate, in the presence of a catalyst which does not contain metals and comprises at least one tertiary amine group. The process can also comprise an additional step in which the carbamates are transformed into the corresponding isocyanates.