A series of substituted 2-alkoxy-1,4-naphthoquinone derivatives were obtained by acid-catalyzed condensation of substituted 2-hydroxy-1,4-naphthoquinones with propan-1-ol, butan-1-ol, or pentan-1-ol in good yields. Based on this reaction a versatile preparative synthesis of spinochrome D was developed.
Key words
2-hydroxy-1,4-naphthoquinones - acid catalysis - 2-
O-alkylation -
n-alkanol - spinochrome D