Heterocycl. Commun. 2018, 24 (4), 177-181
DOI: 10.1515/hc-2017-0143
Yahodkina-Yakovenko M.; Bol'but A.; Vovk M.
Methyl 2-[(cyanophenoxy)methyl]-3-furoates obtained from methyl 2-(chloromethyl)-3-furoate and salicylonitriles undergo tandem cyclization in the presence of excess t-BuOK in N,N-dimethylformamide (DMF) solution at 65°C to give substituted benzofuro[3,2-b]furo[2,3-d]pyridin-4(5H)-ones, derivatives of a novel heterocyclic system.