Polycyclic N-heterocyclic compounds 83: Synthesis of 2,4-disubstituted 5,6-dihydro[1]benzofuro[3′,2′:2,3]oxepino[4,5-d]pyrimidines and 2,4,5-Trisubstituted 5,6-Dihydro[1]benzofuro[2′,3′:5,6]pyrano[4,3-d] pyrimidines from 4-Chloro-5,6-dihydro[1]benzofuro[3

Article abstract of DOI:10.1002/jhet.1900

Treatment of 2-substituted 4-chloro-5,6-dihydro[1]benzofuro[3′, 2′:2,3]oxepino[4,5-d]pyrimidines with simple alcohols and thiols as nucleophile afforded 2-substituted 4-alkoxy (or sulfanyl) derivatives. In the case of alkoxide nucleophiles, rearranged rea