Toward the Synthesis of the Rare <i>N</i>-(Trifluoromethyl)amides and the <i>N</i>-(Difluoromethylene)-<i>N</i>-(trifluoromethyl)amines [RN(CF<sub>3</sub>)CF<sub>2</sub>R′] Using BrF<sub>3</sub>
N-(trifluoromethyl)amides along with aromatic N-(difluoromethylene)-N-(trifluoromethyl)amine derivatives has been developed. The starting materials are the easily available isothiocyanates, and the fluorinating reagent is the commercially available bromine trifluoride. The reaction is performed under mild conditions, and the fluorinated amides and amines are produced in moderate to high yields.
Highly efficient and catalyst-free synthesis of unsymmetrical thioureas under solvent-free conditions
作者:Azim Ziyaei Halimehjani、Yaghoub Pourshojaei、Mohammad R. Saidi
DOI:10.1016/j.tetlet.2008.10.063
日期:2009.1
A highlyefficient and simple synthesis of unsymmetrical thioureas is reported based on the reaction of readily synthesized dithiocarbamates with amines, without using any catalyst under solvent-free conditions. The short reaction time, high yields, and solvent-free conditions are advantages of this method. We did not observe the formation of any symmetric disubstituted thiourea, under these reaction
Dithiocarbamate as an efficient intermediate for the synthesis of 2-amino-1,3,4-thiadiazoles in water
作者:Fezzeh Aryanasab、Azim Ziyaei Halimehjani、Mohammad R. Saidi
DOI:10.1016/j.tetlet.2009.11.100
日期:2010.2
A new and facile protocol for the synthesis of 2-amino-1,3,4-thiadiazoles in water is described. Reaction of acid hydrazides with easily prepared dithiocarbamates gives the corresponding thiadiazoles in moderate to excellent yields. 2-Amino-1,3,4-oxadiazoles were not observed as side products using this procedure.
A new facile synthetic method for the construction of 1,3-oxathiolan-2-ylidenes
作者:Harisadhan Ghosh、C.B. Singh、Siva Murru、Veerababurao Kavala、Bhisma K. Patel
DOI:10.1016/j.tetlet.2008.02.103
日期:2008.4
A new, convenient and efficient syntheticmethod for the construction of 1,3-oxathiolan-2-ylidenes via sodium borohydride reduction of the addition product of dithiocarbamic acid esters with α-bromoketones under basic conditions is reported. This method is general and applicable to a range of systems.