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
Vinylchloroformate-free synthesis of vinyl and allyl(thio) carbamates
申请人:Seelye E. David
公开号:US20050176980A1
公开(公告)日:2005-08-11
The invention generally relates to methods of forming vinyl(thio)carbamates and more particularly to a vinylchloroformate-free method of synthesizing (N-vinyloxycarbonyl)-3-aminopropyltris(trimethylsiloxysilane).
Unmodified Nano-Powder Magnetite Catalyzes a Four- Component Aza-Sakurai Reaction
作者:Ricardo Martínez、Diego J. Ramón、Miguel Yus
DOI:10.1002/adsc.200800089
日期:2008.6.9
for an old material: magnetite is an excellent Lewis acid catalyst for the four-component aza-Sakuraireaction. The process could be repeated up to 15-times without losing effectiveness, with the catalyst recycling being as easy as the use of a simple magnet. The catalyst is selective and could discriminate between aldehyde and ketone functionalities, catalyzing first the reaction with the higher electrophilic
Lanthanum(III) Trifluoromethanesulfonate Catalyzed Direct Synthesis of Ureas from N-Benzyloxycarbonyl-, N-Allyloxycarbonyl-, and N-2,2,2-Trichloroethoxycarbonyl-Protected Amines
作者:Hee-Kwon Kim、Tien Tan Bui
DOI:10.1055/s-0040-1707991
日期:2020.6
A novel lanthanum triflate mediated conversion of N-benzyloxycarbonyl-, N-allyloxycarbonyl-, and N-trichloroethoxycarbonyl-protected amines into nonsymmetric ureas was discovered. In this study, lanthanum triflate was found to be an effective catalyst for preparing various nonsymmetric ureas from protected amines. A variety of protected aromatic and aliphatic carbamates reacted readily with various