79353-76-7Relevant academic research and scientific papers
Cascade reactions of nitrogen-substituted isocyanates: A new tool in heterocyclic chemistry
Vincent-Rocan, Jean-Fran?ois,Ivanovich, Ryan A.,Clavette, Christian,Leckett, Kyle,Bejjani, Julien,Beauchemin, André M.
, p. 315 - 328 (2015/12/26)
In contrast to normal C-substituted isocyanates, nitrogen-substituted isocyanates (N-isocyanates) are rare. Their high reactivity and amphoteric/ambident nature has prevented the scientific community from exploiting their synthetic potential. Recently, we have developed an in situ formation approach using a reversible equilibrium, which allows controlled generation and reactivity of N-isocyanates and prevents the dimerization that is typically observed with these intermediates. This blocked (masked) N-isocyanate approach enables the use of various N-isocyanate precursors to assemble heterocycles possessing the N-N-CO motif, which is often found in agrochemicals and pharmaceuticals. Cascade reactions for the rapid assembly of several valuable 5- and 6-membered heterocycles are reported, including amino-hydantoins, acyl-pyrazoles, acyl-phthalazinones and azauracils. Over 100 different compounds were synthesized using amino-, imino- and amido-substituted N-isocyanates, demonstrating their potential as powerful intermediates in heterocyclic synthesis. Their reactivity also enables access to unprecedented bicyclic derivatives and to substitution patterns of azauracils that are difficult to access using known methods, illustrating that controlled reactivity of N-isocyanates provides new disconnections, and a new tool to assemble complex N-N-CO containing motifs.
Preparation of substituted semicarbazides from corresponding amines and hydrazines via phenyl carbamates
Hron, Rebecca,Jursic, Branko S.
, p. 1540 - 1543 (2014/03/21)
A simple synthetic procedure for the conversion of amines and hydrazines into substituted semicarbazides was developed. The initial condensation between the desired amine and phenyl chloroformate into phenyl carbamate is followed by the addition of hydrazine under basic conditions. The reaction is tolerable to a variety of functional groups, with mild conditions and high percent yields.
Synthesis and anti-trypanosomal activity of novel 5-nitro-2-furaldehyde and 5-nitrothiophene-2-carboxaldehyde semicarbazone derivatives
Cerecetto, Hugo,Di Maio, Rossanna,Ibarruri, Gerardo,Seoane, Gustavo,Denicola, Ana,Peluffo, Gonzalo,Quijano, Celia,Paulino, Margot
, p. 89 - 94 (2007/10/03)
Several novel semicarbazones derivatives were prepared from 5-nitro-2-furaldehyde or 5-nitrothiophene-2-carboxaldehyde, and tested in vitro as potential anti-trypanosomal agents. The compounds were prepared in good to excellent yields in 2-3 steps from readily available starting materials. Some derivatives were found to be active against Trypanosoma cruzi with an activity similar to that of Nifurtimox.
