Syntheses and Diels-Alder reactions of 2-alkylazo-substituted 1,3-butadienes
作者:Klaus Banert、Manfred Hagedorn
DOI:10.1016/s0040-4039(00)60179-x
日期:1992.11
1-Alkyl-1-(2,3-butadienyl)hydrazines 1b,d—g can be oxidized under mild conditions to yield 1-alkyl-2-(1-methylen-2-propenyl)diazenes 3. These E-configurated azo compounds are precursors for rapid inter- and intramolecular [4+2] cycloadditions to give the heterocyclic products 4 and 6–10.