In the reaction of 1-cyano-2-naphthol (4) or its sodium salt with different alkylating agent, the O-alkylated derivatives (5a-d) were produced which underwent ring closure reactions using sodium ethoxide solution to give aminonaphtho [2, 1-b] furan derivatives (6a-d). Ethyl 3- aminonaphtho [2, 1-b] furan-2-carboxylate (8) was reacted with formamide to afford naphtho [1 ', 2 ': 4, 5] furo [3, 2-d] pyrimidine (11) derivatives. The produced pyrimidino compound ...