The condensation of (chloromethyl)heterarenes with aromatic aldehydes was investigated,
resulting in a simple and flexible general procedure for the synthesis of 2-aryl-1-chloro-1-heteroarylalkenes.
The best reaction conditions were found to be heating in N,N-dimethylformamide in the presence of chlorotrimethylsilane as a promoter and water-scavenger.
(chloromethyl)heterocycles - aromatic aldehydes - Knoevenagel condensation - 2-aryl-1-halo-1-heteroarylalkene
- chlorotrimethylsilane