691-24-7Relevant articles and documents
Cycloaddition reaction of tert-butyl isocyanate and a tellurium diimide dimer: Extended helical structure of the ureato telluroxide {[OC(μ-NBu(t))2TeO]2(thf)}∞
Schatte,Chivers,Jaska,Sandblom
, p. 1657 - 1658 (2000)
The reaction of Bu(t)NTe(μ-NBu(t))2TeNBu(t) with Bu(t)NCO in a 1:4 molar ratio in thf produces N,N'-bis(tert-butyl)ureato telluroxide dimers [OC(μ-NBu(t))2TeO]2, which form an extended helical network via weak >C=O···Te interactions.
Carbodiimide Synthesis via Ti-Catalyzed Nitrene Transfer from Diazenes to Isocyanides
Beaumier, Evan P.,McGreal, Meghan E.,Pancoast, Adam R.,Wilson, R. Hunter,Moore, James T.,Graziano, Brendan J.,Goodpaster, Jason D.,Tonks, Ian A.
, p. 11753 - 11762 (2019/12/02)
Simple Ti imido halide complexes such as [Br2Ti(NtBu)py2]2 are competent catalysts for the synthesis of unsymmetrical carbodiimides via Ti-catalyzed nitrene transfer from diazenes or azides to isocyanides. Both alkyl and aryl isocyanides are compatible with the reaction conditions, although product inhibition with sterically unencumbered substrates sometimes limits the yield when diazenes are employed as the oxidant. The reaction mechanism has been investigated both experimentally and computationally, wherein a key feature is that the product release is triggered by electron transfer from an η2-carbodiimide to a Ti-bound azobenzene. This ligand-to-ligand redox buffering obviates the need for high-energy formally TiII intermediates and provides further evidence that substrate and product "redox noninnocence" can promote unusual Ti redox catalytic transformations.
Synthesis of 2-aminobenzoxazoles and 3-aminobenzoxazines via palladium-catalyzed aerobic oxidation of o -aminophenols with isocyanides
Liu, Bifu,Yin, Meizhou,Gao, Hanling,Wu, Wanqing,Jiang, Huanfeng
supporting information, p. 3009 - 3020 (2013/06/26)
A Pd-catalyzed aerobic oxidation of o-aminophenols and isocyanides for the synthesis of 2-aminobenzoxazoles and 3-aminobenzoxazines has been achieved in an air atmosphere. The procedure constructs 2-aminobenzoxazoles and 3-aminobenzoxazines with moderate to excellent yields and a broad substrate scope. Apart from experimental simplicity, this methodology has the advantages of mild reaction conditions and easily accessible starting materials. Furthermore, the utility of this method has also been successfully applied to the synthesis of other types of useful nitrogen heterocycles.