SEARCH Articles Figures Tables 2.6- Naphthyridines from pyridines with synthon From a Pyridine Substrate and Synthon(s) From a Pyridine Substrate and Two Synthons From a Pyridine Substrate with One Synthon From a Pyridine Substrate with Two or More Synthons Naphthyridines by Cyclocondensation of Pyridine Substrates with Synthons Synthon Synthons