I tried refluxing in toluene using activated molecular sieves to absorb any water produced (didn't use Dean-Stark trap as it's a very small scale reaction).
This reaction isn't going by changing the time or temperature conditions. So, I added some (0.5 equivalent) triflic acid to increase the electrophilicity of the carbonyl. The reaction is proceeding but conversion isn't high. Is triflic acid a good choice for this reaction? Should I try using equivalent amount of triflic acid to increase the conversion?