The direct hetarylation of cyclopentadiene, indene, and azulene with several benzopyridines in the presence of acyl halides was studied. It is shown that the most electrophilic N-benzoyl-isoquinolinium salt is capable of hetarylating CH acids with pKa<21.
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Sheinkman, A.K., Samoilenko, G.V., Baranov, S.N. et al. Hetarylation of cyclopentadiene, indene, and azulene. Chem Heterocycl Compd 11, 1168–1173 (1975). https://doi.org/10.1007/BF00667616
- Organic Chemistry