Elusive 2-aminofuran Diels–Alder substrates for a straightforward synthesis of polysubstituted anilines
作者:Ana G. Neo、Ana Bornadiego、Jesús Díaz、Stefano Marcaccini、Carlos F. Marcos
DOI:10.1039/c3ob41411f
日期:——
The first multicomponent coupling of isocyanides, α,β-unsaturated carbonylic compounds and dienophiles, based on the trapping of unstable intermediate 2-aminofurans, is described. This novel tandem [4 + 1]â[4 + 2] cycloaddition is efficiently catalysed by yttrium triflate and constitutes an operationally simple and highly convergent approach to a variety of polysubstituted anilines. Moreover, this methodology permits the use of tert-butylisocyanide as a convertible isocyanide to yield directly N-unprotected anilines in the same pot.