A series of furanyl-, thiophenyl-, and pyrrolo-substituted pyrroles were prepared
via the 1,3-dipolar cycloaddition of unsymmetrical münchnones and nitrovinylheterocycles.
The regiochemical outcome of the furan and thiophene cycloadditions compares favorably
to previously reported cycloadditions with β-nitrostyrene, while the nitrovinylpyrrole
cycloadditions mirror the results observed with nitrovinylindole.
Key words
cycloaddition - heterocycles - pyrroles - regioselectivity - münchnone