The reaction of N-amino-1,10-phenanthrolinium mesitylenesulfonate with acceptor-substituted alkenes in the K2CO3–DMSO system gave 3- and 2,3-substituted pyrazolo[1,5-a][1,10]phenanthrolines. A wide range of alkenes enter into this reaction; however, in the case of nitro derivatives, complex mixtures of products were formed.
- 1,3-dipolar cycloaddition
- acceptor alkenes
- N-aminophenanthrolinium cation