Clarke, SGilchrist, Thomas L.Lemos, A.Roberts, Tony G.2012-03-092012-03-091991Clarke, S. Reactions of azoalkenes derived from hydrazones of ethyl bromopyruvate with electron rich alkenes and heterocycles, Tetrahedron, 47, 29, 5615-5624, 1991.00404020AUT: ALE01411;http://hdl.handle.net/10400.1/934Three hydrazones of ethyl bromopyruvate, the dinitrophenylhydrazone 2a, the toluene-4-sulphonylhydrazone 2b and the t-butoxycarbonylhydrazone 2c, have been reacted with a series of nucleophilic alkenes and heterocycles in the presence of sodium carbonate. Azoalkenes 3 are presumed as intermediates and adducts have been isolated. The azoalkenes derived from hydrazones 2a and 2c are found to be useful electrophiles and electrophilic dienes.engCicloadiçãoDiels-AlderHeterocyclesjournal article2012-02-27