Cascade reactions of nitrogen-substituted isocyanates: a new tool in heterocyclic chemistry
作者:Jean-François Vincent-Rocan、Ryan A. Ivanovich、Christian Clavette、Kyle Leckett、Julien Bejjani、André M. Beauchemin
DOI:10.1039/c5sc03197d
日期:——
In contrast to normal C-substituted isocyanates, nitrogen-substituted isocyanates (N-isocyanates) are rare. Their high reactivity and amphotheric nature has prevented the scientific community from exploiting their synthetic potential. Recently, we have...
Intramolecular Alkene Aminocarbonylation Using Concerted Cycloadditions of Amino-Isocyanates
作者:Ryan A. Ivanovich、Christian Clavette、Jean-François Vincent-Rocan、Jean-Grégoire Roveda、Serge I. Gorelsky、André M. Beauchemin
DOI:10.1002/chem.201600574
日期:2016.6.1
temperatures (150–200 °C), and issues included competing hydroamination and N‐isocyanate dimerization pathways. Herein, improved conditions for concerted intramolecular alkene aminocarbonylation with N‐isocyanates are reported. The use of βN‐benzyl carbazate precursors allows the effective minimization of N‐isocyanate dimerization. Diminished dimerization leads to higher yields of alkene aminocarbonylation
Diversity-Oriented Synthesis of Hydrazine-Derived Compounds from Amino Isocyanates Generated In Situ
作者:Christian Clavette、Jean-François Vincent Rocan、André M. Beauchemin
DOI:10.1002/anie.201306379
日期:2013.11.25
Behind the mask: Nitrogen‐substituted isocyanates are rare and their synthetic potential is virtually untapped. Simple masked precursors can form amphoteric aminoisocyanate intermediates in situ, and allows the synthesis of complex hydrazine derivatives upon addition with amines. This reactivity was used in a cascade substitution/hydroamination sequence, and in the assembly of azadipeptide analogues