3436 NOTES Vol. 77 aminopyridine with acrylonitrile, a non-cyclic analog of 2-vinylpyridineI also have failed.* It should be noted that while cyclohexylamine was pyridylethylated in 60y0 yield under acidic conditions, the same reaction failed when it was attempted earlier5 under non-catalytic conditions. The mechanism for the acid-catalyzed pyridylethylation of primary amines is probably the same as that suggested earlier4 for the analogous reactions with ...
![1-[(2-fluorophenyl)methyl]-1-(3-imidazol-1-ylpropyl)-3-phenyl-urea结构式](https://image.chemsrc.com/caspic/336/6312-12-5.png)
