3-nitrochromene derivatives as 2π components in 1,3-dipolar cycloadditions of azomethine ylides

2005 Benzopyran derivatives R 0350 3-Nitrochromene Derivatives as 2π Components in 1,3-Dipolar Cycloadditions of Azomethine Ylides. — The use of the title compounds as 2π components in 1,3-dipolar cycloadditions of azomethine ylides allows the assembly of polysubstituted benzo- pirano[3,4-c]-pyrrolidines from simple precursors in one-pot reaction. (XIIa) is unsta- ble in the presence of oxygen. It is transformed into the pyrrole derivative (XIII) at room temperature in a short period of time (no yield given). — (NYERGES*, M.; VIRANYI, A.; MARTH, G.; DANCSO, A.; BLASKO, G.; TOEKE, L.; Synlett 2004, 15, 2761-2765; Org. Chem. Technol. Res. Group, Hung. Acad. Sci., Tech. Univ., H-1521 Budapest, Hung.; Eng.) — Steudel 20- 130

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Page 1: 3-Nitrochromene Derivatives as 2π Components in 1,3-Dipolar Cycloadditions of Azomethine Ylides

2005

Benzopyran derivativesR 0350 3-Nitrochromene Derivatives as 2π Components in 1,3-Dipolar Cycloadditions of

Azomethine Ylides. — The use of the title compounds as 2π components in 1,3-dipo-lar cycloadditions of azomethine ylides allows the assembly of polysubstituted benzo-pirano[3,4-c]-pyrrolidines from simple precursors in one-pot reaction. (XIIa) is unsta-ble in the presence of oxygen. It is transformed into the pyrrole derivative (XIII) at room temperature in a short period of time (no yield given). — (NYERGES*, M.; VIRANYI, A.; MARTH, G.; DANCSO, A.; BLASKO, G.; TOEKE, L.; Synlett 2004, 15, 2761-2765; Org. Chem. Technol. Res. Group, Hung. Acad. Sci., Tech. Univ., H-1521 Budapest, Hung.; Eng.) — Steudel

20- 130

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