3a-O-ethyl 4-O-methyl 7a-ethoxy-2,3-dimethyl-6-oxo-3,7-dihydro-2H-furo[2,3-b]pyridine-3a,4-dicarboxylate

5,5-dimethyl-2-oxooxolane-3-carbonitrile

3-Bromoimidazo[1,2-a]pyridine-2-carbaldehyde

3-bromo-2-diethoxymethylimidazo[1,2-a]pyridine

ethyl 4-phenyl-1-propylpiperidine-4-carboxylate