A facile one-pot, phosgene-free method for the synthesis of N-phenylcarbamates is developed. Using this method, various aromatic carbamates could be prepared from aromatic amines, CO2 and metal alk...
Synthesis of Methyl-1-(<i>tert</i>-butoxycarbonylamino)-2-vinylcyclopropanecarboxylate via a Hofmann Rearrangement Utilizing Trichloroisocyanuric Acid as an Oxidant
作者:Zackary D. Crane、Paul J. Nichols、Tarek Sammakia、Peter J. Stengel
DOI:10.1021/jo101504e
日期:2011.1.7
A trichloroisocyanuric acid (TCCA) mediated Hofmann rearrangement was utilized to synthesize methyl-1-(tert-butoxycarbonylamino)-2-vinylcyclopropanecarboxylate. A variety of functional groups are tolerated in this reaction including vinyl, cyclopropyl, pyridyl, aryl, benzyl, and nitro groups.
A new and convenient in-situ method of generating phenyl isocyanates from anilines using oxalyl chloride
作者:Lynette M. Oh、P.Grant Spoors、Richard M. Goodman
DOI:10.1016/j.tetlet.2004.04.043
日期:2004.6
A new and convenient method of generating phenyl isocyanates from anilines using oxalylchloride is described. Acylation of a variety of substituted aniline hydrochlorides with oxalylchloride affords the intermediate oxamic chlorides, which smoothly undergo thermal decomposition to the corresponding isocyanates.
Carbon dioxide (CO2) is a nontoxic and inexpensive C1 building block, which can be used for the synthesis of valuable chemicals such as aromatic carbamatesfromanilines and methanol (MeOH), glycerol carbonate from glycerol, and cyclic carbonates from diols. However, these reactions generate water as the byproduct and suffer from thermodynamic limits, which lead to low yields. Calcium carbide (CaC2)
Copper-Catalyzed Coupling of Amines with Carbazates: An Approach to Carbamates
作者:Song-Ning Wang、Guo-Yu Zhang、Adedamola Shoberu、Jian-Ping Zou
DOI:10.1021/acs.joc.1c01031
日期:2021.7.2
A new approach for the preparation of carbamates via the copper-catalyzed cross-coupling reaction of amines with alkoxycarbonyl radicals generated from carbazates is described. This environmentally friendly protocol takes place under mild conditions and is compatible with a wide range of amines, including aromatic/aliphatic and primary/secondary substrates.