An Efficient Approach to 2-CF3-Indoles Based on ortho-Nitrobenzaldehydes
作者:Vasiliy M. Muzalevskiy、Zoia A. Sizova、Vladimir T. Abaev、Valentine G. Nenajdenko
DOI:10.3390/molecules26237365
日期:——
The catalytic olefination reaction of 2-nitrobenzaldehydes with CF3CCl3 afforded stereoselectively trifluoromethylated ortho-nitrostyrenes in up to 88% yield. The reaction of these alkenes with pyrrolidine permits preparation of α-CF3-β-(2-nitroaryl) enamines. Subsequent one pot reduction of nitro-group by Fe-AcOH-H2O system initiated intramolecular cyclization to afford 2-CF3-indoles. Target products