A high yield synthesis of various 2-hydroxy-1,4-naphtoquinones was ach
ieved by SeO2 oxidation of 1-tetralones into the corresponding 1,2-qui
nones, followed by heterogeneous phase KO2 mediated oxidation. Applica
tion of this synthesis to 5,7,8-trimethoxy-1-tetralone gave 2-hydroxy-
5,7,8-trimethoxy-1,4-naphtoquinone 3d or monpain trimethylether. (C) 1
997 Elsevier Science Ltd.