A novel organocatalytic [3+2] annulation/oxidative aromatizationreaction of enals with 2-halophenols or β-naphthols is reported. This process enables chemo- and regioselective access to 2-arylbenzofuran-3-carbaldehydes without the use of transition metals or strong oxidants. Preliminary mechanistic studies reveal that an unprecedented, organocatalytic, direct α-arylation pathway is involved.
The compounds of Formula (I) wherein R1, R21, R22, R23, R24, Y and R3 have the meanings as given in the description, the salts thereof, the N-oxides of the compounds and the salts thereof and the stereoisomers of the compounds, the salts, the N-oxides of the compounds and the N-oxides of the salts thereof are effective inhibitors of the type 5 phosphodiesterase.
The compounds of formula (I) wherein R1, R2, R21, R22, R23, R24, Y and R3 have the meanings as given in the description, the salts thereof, and the stereoisomers of the compounds and the salts thereof are effective inhibitors of the type 5 phosphodiesterase.
The compounds of formula (I) wherein R1, R21, R22, R23, R24, Y and R3 have the meanings as given in the description, the salts thereof, and the stereoisomers of the compounds and the salts thereof are effective inhibitors of the type 5 phosphodiesterase.
The compounds of Formula (I),
wherein R1, R2, R21, R22, R23, R24, Y and R3 have the meanings as given in the description, the salts thereof, the stereoisomers of the compounds and the salts thereof are effective inhibitors of the type 5 phosphodiesterase.