3-Bromo-1,1,1-trifluoro-2-propanone → 1-Methyl-2-(2-naphthyl)-5-(trifluoromethyl)pyrrole-3-carbonitrile

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Reaction Steps

A solution of β-(methylamino)-2-naphthaleneacrylonitrile (2.5 g, 0.012 mol) in toluene and acetic acid is treated dropwise with 3-bromo-1,1,1-trifluoro-2-propanone (2.3 g, 0.012 mol) at room temperature, heated at reflux temperature for 6 hours, cooled and diluted with ethyl acetate. The organic phase is washed sequentially with water and 5N NaOH, dried (Na2SO4) and concentrated in vacuo to give a brown oil residue. The residue is flash chromatographed (silica gel, hexanes/ethyl acetate, 80/20) to give the title compound as a yellow solid, mp 134° C., identified by mass spectral, IR and NMR analyses.

Provenance & Evidence